{"id":44276,"date":"2022-12-26T21:53:35","date_gmt":"2022-11-23T15:37:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8golang%e5%ae%9e%e7%8e%b0douglas-peuker%e7%ae%97%e6%b3%95\/"},"modified":"2024-04-29T07:05:51","modified_gmt":"2024-04-28T23:05:51","slug":"%e4%bd%bf%e7%94%a8golang%e5%ae%9e%e7%8e%b0douglas-peuker%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8golang%e5%ae%9e%e7%8e%b0douglas-peuker%e7%ae%97%e6%b3%95\/","title":{"rendered":"\u4f7f\u7528Golang\u5b9e\u73b0Douglas Peuker\u7b97\u6cd5"},"content":{"rendered":"<h2>\u8bf7\u4ee5\u4e2d\u6587\u5c06\u4e0b\u8ff0\u5185\u5bb9\u6539\u8ff0\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u4e00\u4e2a\u9009\u9879\uff1a<\/h2>\n<p>\u5185\u5bb9<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Douglas Peuker \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u306e\u66f2\u7dda\u9593\u5f15\u304d\u304c\u3069\u306e\u304f\u3089\u3044\u6642\u9593\u304c\u304b\u304b\u308b\u306e\u304b\u78ba\u8a8d\u3057\u305f\u304b\u3063\u305f<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u306e\u3067\u3001\u7c21\u5358\u306b golang \u3067\u66f8\u3044\u3066\u307f\u305f<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u3053\u3061\u3089\u3092\u53c2\u8003\u306b\u3055\u305b\u3066\u3044\u305f\u3060\u3044\u305f http:\/\/www.trail-note.net\/tech\/thinout\/<\/ul>\n<\/li>\n<\/ul>\n<p>\u3060\u3044\u305f\u3044\u306e\u76ee\u5b89\u3092\u898b\u308b\u305f\u3081\u306e\u66f8\u6368\u3066\u30b3\u30fc\u30c9\u306a\u306e\u3067\u30c4\u30c3\u30b3\u30df\u3069\u3053\u308d\u304c\u591a\u3044\u306e\u306f\u3054\u611b\u5b0c<\/p>\n<h2>\u57fa\u51c6\u6d4b\u8bd5<\/h2>\n<pre class=\"post-pre\"><code><span class=\"nv\">$ <\/span>go <span class=\"nb\">test<\/span> <span class=\"nt\">-bench<\/span> <span class=\"nb\">.<\/span>\r\ngoos: darwin\r\ngoarch: amd64\r\npkg: xxxxxx\r\nBenchmark10-4             200000           7125 ns\/op  -&gt;  7.1 us\r\nBenchmark100-4              1000        1234958 ns\/op  -&gt;  1.2 ms\r\nBenchmark1000-4               10      129394222 ns\/op  -&gt;  0.1 ms\r\nBenchmark10000-4               1     2101666871 ns\/op  -&gt;  2.1  s\r\nBenchmark100000-4              1    12936923196 ns\/op  -&gt; 12.9  s\r\nPASS\r\nok      xxxxxx  25.437s\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">1\u4e07\u70b9 \u2192 1000\u70b9 \u3067 \u79d2\u306e\u30aa\u30fc\u30c0\u30fc<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u52d5\u7684\u306b\u8a08\u7b97\u3059\u308b\u306e\u306f\u7d50\u69cb\u30ad\u30c4\u30a4\u3067\u3059\u306d<\/ul>\n<h2>\u6e90\u4ee3\u7801<\/h2>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">dp_test<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"math\"<\/span>\r\n    <span class=\"s\">\"math\/rand\"<\/span>\r\n    <span class=\"s\">\"testing\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Setting<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">i1<\/span><span class=\"p\">,<\/span> <span class=\"n\">i2<\/span> <span class=\"kt\">int<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Point<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">x<\/span>       <span class=\"kt\">float64<\/span>\r\n    <span class=\"n\">y<\/span>       <span class=\"kt\">float64<\/span>\r\n    <span class=\"n\">setting<\/span> <span class=\"o\">*<\/span><span class=\"n\">Setting<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Max<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">dist<\/span>   <span class=\"kt\">float64<\/span>\r\n    <span class=\"n\">i<\/span>      <span class=\"kt\">int<\/span>\r\n    <span class=\"n\">i1<\/span><span class=\"p\">,<\/span> <span class=\"n\">i2<\/span> <span class=\"kt\">int<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark10<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">10<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark100<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">100<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark1000<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">1000<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark10000<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">10000<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark100000<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">100000<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">,<\/span> <span class=\"n\">num<\/span> <span class=\"kt\">int<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">limit<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">1000<\/span>\r\n\r\n    <span class=\"k\">for<\/span> <span class=\"n\">j<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">0<\/span><span class=\"p\">;<\/span> <span class=\"n\">j<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"n\">N<\/span><span class=\"p\">;<\/span> <span class=\"n\">j<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n\r\n        <span class=\"c\">\/\/ \u521d\u671f\u5316<\/span>\r\n        <span class=\"n\">points<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">([]<\/span><span class=\"n\">Point<\/span><span class=\"p\">,<\/span> <span class=\"n\">num<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">points<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"n\">rand<\/span><span class=\"o\">.<\/span><span class=\"n\">Float64<\/span><span class=\"p\">()<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">y<\/span> <span class=\"o\">=<\/span> <span class=\"n\">rand<\/span><span class=\"o\">.<\/span><span class=\"n\">Float64<\/span><span class=\"p\">()<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"k\">if<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span> <span class=\"o\">&lt;<\/span> <span class=\"m\">2<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"k\">return<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">points<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">=<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">Setting<\/span><span class=\"p\">{<\/span>\r\n                <span class=\"n\">i1<\/span><span class=\"o\">:<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span>\r\n                <span class=\"n\">i2<\/span><span class=\"o\">:<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span> <span class=\"o\">-<\/span> <span class=\"m\">1<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"p\">}<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"m\">0<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">=<\/span> <span class=\"no\">nil<\/span>\r\n        <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span><span class=\"o\">-<\/span><span class=\"m\">1<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">=<\/span> <span class=\"no\">nil<\/span>\r\n\r\n        <span class=\"k\">if<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">limit<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"n\">limit<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"n\">StartTimer<\/span><span class=\"p\">()<\/span>\r\n        <span class=\"k\">for<\/span> <span class=\"n\">num<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">2<\/span><span class=\"p\">;<\/span> <span class=\"n\">num<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">limit<\/span><span class=\"p\">;<\/span> <span class=\"n\">num<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"k\">var<\/span> <span class=\"n\">max<\/span> <span class=\"n\">Max<\/span>\r\n            <span class=\"k\">for<\/span> <span class=\"n\">i<\/span><span class=\"p\">,<\/span> <span class=\"n\">p<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">points<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"k\">if<\/span> <span class=\"n\">p<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">==<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n                    <span class=\"k\">continue<\/span>\r\n                <span class=\"p\">}<\/span>\r\n                <span class=\"n\">x<\/span><span class=\"p\">,<\/span> <span class=\"n\">y<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">x<\/span><span class=\"p\">,<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">y<\/span>\r\n\r\n                <span class=\"n\">s<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">p<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span>\r\n                <span class=\"n\">x1<\/span><span class=\"p\">,<\/span> <span class=\"n\">x2<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">x<\/span><span class=\"p\">,<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">x<\/span>\r\n                <span class=\"n\">y1<\/span><span class=\"p\">,<\/span> <span class=\"n\">y2<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">y<\/span><span class=\"p\">,<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">y<\/span>\r\n\r\n                <span class=\"n\">numerator<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Abs<\/span><span class=\"p\">((<\/span><span class=\"n\">y2<\/span><span class=\"o\">-<\/span><span class=\"n\">y1<\/span><span class=\"p\">)<\/span><span class=\"o\">*<\/span><span class=\"n\">x<\/span> <span class=\"o\">-<\/span> <span class=\"p\">(<\/span><span class=\"n\">x2<\/span><span class=\"o\">-<\/span><span class=\"n\">x1<\/span><span class=\"p\">)<\/span><span class=\"o\">*<\/span><span class=\"n\">y<\/span> <span class=\"o\">+<\/span> <span class=\"n\">y1<\/span><span class=\"o\">*<\/span><span class=\"n\">x2<\/span> <span class=\"o\">-<\/span> <span class=\"n\">y2<\/span><span class=\"o\">*<\/span><span class=\"n\">x1<\/span><span class=\"p\">)<\/span>\r\n                <span class=\"n\">denominator<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Pow<\/span><span class=\"p\">((<\/span><span class=\"n\">y2<\/span><span class=\"o\">-<\/span><span class=\"n\">y1<\/span><span class=\"p\">),<\/span> <span class=\"m\">2<\/span><span class=\"p\">)<\/span> <span class=\"o\">+<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Pow<\/span><span class=\"p\">((<\/span><span class=\"n\">x2<\/span><span class=\"o\">-<\/span><span class=\"n\">x1<\/span><span class=\"p\">),<\/span> <span class=\"m\">2<\/span><span class=\"p\">))<\/span>\r\n                <span class=\"n\">dist<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">numerator<\/span> <span class=\"o\">\/<\/span> <span class=\"n\">denominator<\/span>\r\n\r\n                <span class=\"k\">if<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">dist<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">dist<\/span> <span class=\"p\">{<\/span>\r\n                    <span class=\"n\">max<\/span> <span class=\"o\">=<\/span> <span class=\"n\">Max<\/span><span class=\"p\">{<\/span>\r\n                        <span class=\"n\">dist<\/span><span class=\"o\">:<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span>\r\n                        <span class=\"n\">i<\/span><span class=\"o\">:<\/span>    <span class=\"n\">i<\/span><span class=\"p\">,<\/span>\r\n                        <span class=\"n\">i1<\/span><span class=\"o\">:<\/span>   <span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span><span class=\"p\">,<\/span>\r\n                        <span class=\"n\">i2<\/span><span class=\"o\">:<\/span>   <span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span><span class=\"p\">,<\/span>\r\n                    <span class=\"p\">}<\/span>\r\n                <span class=\"p\">}<\/span>\r\n            <span class=\"p\">}<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">=<\/span> <span class=\"no\">nil<\/span>\r\n\r\n            <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span> <span class=\"o\">+<\/span> <span class=\"m\">1<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span>\r\n            <span class=\"p\">}<\/span>\r\n\r\n            <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span> <span class=\"o\">+<\/span> <span class=\"m\">1<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span>\r\n            <span class=\"p\">}<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"n\">StopTimer<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ed9\u6211\u4e00\u4e2a\u9644\u8d60\u54c1<\/h2>\n<p>\u7a0d\u5fae\u4f18\u5316\u540e\uff0c\u5206\u6570\u4ece10\u4e07\u70b9\u964d\u4f4e\u5230\u4e861000\u70b9\uff0c\u65f6\u95f4\u5927\u7ea6\u4e3a150\u6beb\u79d2\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$ <\/span>go <span class=\"nb\">test<\/span> <span class=\"nt\">-bench<\/span> <span class=\"nb\">.<\/span>\r\ngoos: darwin\r\ngoarch: amd64\r\npkg: xxxxxx\r\nBenchmark10-4             500000          3341 ns\/op -&gt;   3us\r\nBenchmark100-4             50000         35322 ns\/op -&gt;  35us\r\nBenchmark1000-4             2000       1003985 ns\/op -&gt;   1ms\r\nBenchmark10000-4             100      13531037 ns\/op -&gt;  13ms\r\nBenchmark100000-4             10     152950556 ns\/op -&gt; 152ms\r\nBenchmark1000000-4             1    2231156196 ns\/op -&gt;   2s\r\nPASS\r\nok      xxxxxx  26.530s\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">dp_test<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"math\"<\/span>\r\n    <span class=\"s\">\"math\/rand\"<\/span>\r\n    <span class=\"s\">\"testing\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Setting<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">i1<\/span><span class=\"p\">,<\/span> <span class=\"n\">i2<\/span> <span class=\"kt\">int<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Point<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">x<\/span>        <span class=\"kt\">float64<\/span>\r\n    <span class=\"n\">y<\/span>        <span class=\"kt\">float64<\/span>\r\n    <span class=\"n\">setting<\/span>  <span class=\"o\">*<\/span><span class=\"n\">Setting<\/span>\r\n    <span class=\"n\">distance<\/span> <span class=\"kt\">float64<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Max<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">dist<\/span>   <span class=\"kt\">float64<\/span>\r\n    <span class=\"n\">i<\/span>      <span class=\"kt\">int<\/span>\r\n    <span class=\"n\">i1<\/span><span class=\"p\">,<\/span> <span class=\"n\">i2<\/span> <span class=\"kt\">int<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark10<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">10<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark100<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">100<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark1000<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">1000<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark10000<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">10000<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark100000<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">100000<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Benchmark1000000<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"m\">1000000<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">bench<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"o\">*<\/span><span class=\"n\">testing<\/span><span class=\"o\">.<\/span><span class=\"n\">B<\/span><span class=\"p\">,<\/span> <span class=\"n\">num<\/span> <span class=\"kt\">int<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">limit<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">1000<\/span>\r\n\r\n    <span class=\"k\">for<\/span> <span class=\"n\">j<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">0<\/span><span class=\"p\">;<\/span> <span class=\"n\">j<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"n\">N<\/span><span class=\"p\">;<\/span> <span class=\"n\">j<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n\r\n        <span class=\"c\">\/\/ \u521d\u671f\u5316<\/span>\r\n        <span class=\"n\">points<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">([]<\/span><span class=\"n\">Point<\/span><span class=\"p\">,<\/span> <span class=\"n\">num<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">points<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"n\">rand<\/span><span class=\"o\">.<\/span><span class=\"n\">Float64<\/span><span class=\"p\">()<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">y<\/span> <span class=\"o\">=<\/span> <span class=\"n\">rand<\/span><span class=\"o\">.<\/span><span class=\"n\">Float64<\/span><span class=\"p\">()<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">distance<\/span> <span class=\"o\">=<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">NaN<\/span><span class=\"p\">()<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"k\">if<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span> <span class=\"o\">&lt;<\/span> <span class=\"m\">2<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"k\">return<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">points<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">=<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">Setting<\/span><span class=\"p\">{<\/span>\r\n                <span class=\"n\">i1<\/span><span class=\"o\">:<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span>\r\n                <span class=\"n\">i2<\/span><span class=\"o\">:<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span> <span class=\"o\">-<\/span> <span class=\"m\">1<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"p\">}<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"m\">0<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">=<\/span> <span class=\"no\">nil<\/span>\r\n        <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span><span class=\"o\">-<\/span><span class=\"m\">1<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">=<\/span> <span class=\"no\">nil<\/span>\r\n\r\n        <span class=\"k\">if<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">limit<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"n\">limit<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">points<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"n\">StartTimer<\/span><span class=\"p\">()<\/span>\r\n        <span class=\"k\">for<\/span> <span class=\"n\">num<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">2<\/span><span class=\"p\">;<\/span> <span class=\"n\">num<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">limit<\/span><span class=\"p\">;<\/span> <span class=\"n\">num<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"k\">var<\/span> <span class=\"n\">max<\/span> <span class=\"n\">Max<\/span>\r\n            <span class=\"k\">for<\/span> <span class=\"n\">i<\/span><span class=\"p\">,<\/span> <span class=\"n\">p<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">points<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"k\">if<\/span> <span class=\"o\">!<\/span><span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">IsNaN<\/span><span class=\"p\">(<\/span><span class=\"n\">p<\/span><span class=\"o\">.<\/span><span class=\"n\">distance<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n                    <span class=\"k\">continue<\/span>\r\n                <span class=\"p\">}<\/span>\r\n\r\n                <span class=\"k\">if<\/span> <span class=\"n\">p<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">==<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n                    <span class=\"k\">continue<\/span>\r\n                <span class=\"p\">}<\/span>\r\n\r\n                <span class=\"n\">s<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">p<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span>\r\n                <span class=\"n\">x<\/span><span class=\"p\">,<\/span> <span class=\"n\">y<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">x<\/span><span class=\"p\">,<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">y<\/span>\r\n                <span class=\"n\">x1<\/span><span class=\"p\">,<\/span> <span class=\"n\">x2<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">x<\/span><span class=\"p\">,<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">x<\/span>\r\n                <span class=\"n\">y1<\/span><span class=\"p\">,<\/span> <span class=\"n\">y2<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">y<\/span><span class=\"p\">,<\/span> <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">y<\/span>\r\n\r\n                <span class=\"n\">numerator<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Abs<\/span><span class=\"p\">((<\/span><span class=\"n\">y2<\/span><span class=\"o\">-<\/span><span class=\"n\">y1<\/span><span class=\"p\">)<\/span><span class=\"o\">*<\/span><span class=\"n\">x<\/span> <span class=\"o\">-<\/span> <span class=\"p\">(<\/span><span class=\"n\">x2<\/span><span class=\"o\">-<\/span><span class=\"n\">x1<\/span><span class=\"p\">)<\/span><span class=\"o\">*<\/span><span class=\"n\">y<\/span> <span class=\"o\">+<\/span> <span class=\"n\">y1<\/span><span class=\"o\">*<\/span><span class=\"n\">x2<\/span> <span class=\"o\">-<\/span> <span class=\"n\">y2<\/span><span class=\"o\">*<\/span><span class=\"n\">x1<\/span><span class=\"p\">)<\/span>\r\n                <span class=\"n\">denominator<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Pow<\/span><span class=\"p\">((<\/span><span class=\"n\">y2<\/span><span class=\"o\">-<\/span><span class=\"n\">y1<\/span><span class=\"p\">),<\/span> <span class=\"m\">2<\/span><span class=\"p\">)<\/span> <span class=\"o\">+<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Pow<\/span><span class=\"p\">((<\/span><span class=\"n\">x2<\/span><span class=\"o\">-<\/span><span class=\"n\">x1<\/span><span class=\"p\">),<\/span> <span class=\"m\">2<\/span><span class=\"p\">))<\/span>\r\n                <span class=\"n\">dist<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">numerator<\/span> <span class=\"o\">\/<\/span> <span class=\"n\">denominator<\/span>\r\n                <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">distance<\/span> <span class=\"o\">=<\/span> <span class=\"n\">dist<\/span>\r\n\r\n                <span class=\"k\">if<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">dist<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">dist<\/span> <span class=\"p\">{<\/span>\r\n                    <span class=\"n\">max<\/span> <span class=\"o\">=<\/span> <span class=\"n\">Max<\/span><span class=\"p\">{<\/span>\r\n                        <span class=\"n\">dist<\/span><span class=\"o\">:<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span>\r\n                        <span class=\"n\">i<\/span><span class=\"o\">:<\/span>    <span class=\"n\">i<\/span><span class=\"p\">,<\/span>\r\n                        <span class=\"n\">i1<\/span><span class=\"o\">:<\/span>   <span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span><span class=\"p\">,<\/span>\r\n                        <span class=\"n\">i2<\/span><span class=\"o\">:<\/span>   <span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span><span class=\"p\">,<\/span>\r\n                    <span class=\"p\">}<\/span>\r\n                <span class=\"p\">}<\/span>\r\n            <span class=\"p\">}<\/span>\r\n            <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span> <span class=\"o\">=<\/span> <span class=\"no\">nil<\/span>\r\n\r\n            <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span> <span class=\"o\">+<\/span> <span class=\"m\">1<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span>\r\n                <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">distance<\/span> <span class=\"o\">=<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">NaN<\/span><span class=\"p\">()<\/span>\r\n            <span class=\"p\">}<\/span>\r\n\r\n            <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span> <span class=\"o\">+<\/span> <span class=\"m\">1<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i2<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">setting<\/span><span class=\"o\">.<\/span><span class=\"n\">i1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">max<\/span><span class=\"o\">.<\/span><span class=\"n\">i<\/span>\r\n                <span class=\"n\">points<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">distance<\/span> <span class=\"o\">=<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">NaN<\/span><span class=\"p\">()<\/span>\r\n            <span class=\"p\">}<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"n\">StopTimer<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u8bf7\u4ee5\u4e2d\u6587\u5c06\u4e0b\u8ff0\u5185\u5bb9\u6539\u8ff0\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u4e00\u4e2a\u9009\u9879\uff1a \u5185\u5bb9 Douglas Peuker \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u306e\u66f2\u7dda\u9593\u5f15\u304d\u304c [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44276","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4f7f\u7528Golang\u5b9e\u73b0Douglas Peuker\u7b97\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528golang\u5b9e\u73b0douglas-peuker\u7b97\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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