{"id":207457,"date":"2025-07-08T08:38:09","date_gmt":"2025-07-08T00:38:09","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207457\/"},"modified":"2025-07-08T08:38:09","modified_gmt":"2025-07-08T00:38:09","slug":"go-%e4%b8%ad%e6%8c%89-v-w-%e5%af%b9-i-%e6%95%b0%e7%bb%84%e8%bf%9b%e8%a1%8c%e6%8e%92%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207457\/","title":{"rendered":"Go \u4e2d\u6309 v\/w \u5bf9 i \u6570\u7ec4\u8fdb\u884c\u6392\u5e8f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> Go \u4e2d\u6309 v\/w \u5bf9 i \u6570\u7ec4\u8fdb\u884c\u6392\u5e8f<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-22 19:24:36<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u6709\u5fd7\u8005\uff0c\u4e8b\u7adf\u6210\uff01\u5982\u679c\u4f60\u5728\u5b66\u4e60Golang<\/span>\uff0c\u90a3\u4e48\u672c\u6587\u300aGo \u4e2d\u6309 v\/w \u5bf9 i \u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\u300b<\/span>\uff0c\u5c31\u5f88\u9002\u5408\u4f60\uff01\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec<\/span>\uff0c\u82e5\u662f\u4f60\u5bf9\u672c\u6587\u611f\u5174\u8da3\uff0c\u6216\u8005\u662f\u60f3\u641e\u61c2\u5176\u4e2d\u67d0\u4e2a\u77e5\u8bc6\u70b9\uff0c\u5c31\u8bf7\u4f60\u7ee7\u7eed\u5f80\u4e0b\u770b\u5427~<\/span><\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u60f3\u6309 v[i]\/w[i]<\/code> \u964d\u5e8f\u5bf9\u7d22\u5f15\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\uff0c\u5176\u4e2d v<\/code> \u548c w<\/code> \u662f\u53e6\u5916\u4e24\u4e2a\u6574\u6570\u6570\u7ec4\u3002\u8fd9\u662f\u6211\u5728 go \u4e2d\u5c1d\u8bd5\u8fc7\u7684\uff1a<\/p>\n

package main\nimport \"fmt\"\nimport \"sort\"\n\nfunc main() {\n    v := [3]int{5, 6, 3}\n    w := [3]int{4, 5, 2}\n    indices := make([]int, 3)\n    for i := range indices {\n        indices[i] = i\n    }\n    sort.Slice(indices, func(a, b int) bool {\n        return float32(v[a])\/float32(w[a]) > float32(v[b])\/float32(w[b])\n    })\n    fmt.Println(indices)\n}<\/pre>\n
\u6211\u671f\u671b\u8f93\u51fa\u4e3a [2,0,1]<\/code> \u56e0\u4e3a 3\/2 > 5\/4 > 6\/5<\/em> \u4f46\u5b9e\u9645\u8f93\u51fa\u4e3a [0,2,1] <\/code>\u3002\u8c01\u80fd\u5e2e\u6211\u627e\u5230\u95ee\u9898\u51fa\u5728\u54ea\u91cc\u5417\uff1f\u8c22\u8c22\u3002<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u4e3a\u4e86\u4e0d\u6539\u53d8 v \u548c w \u6570\u7ec4\uff08\u8fd9\u53ef\u80fd\u4f1a\u5f88\u6602\u8d35\uff09\uff0c\u6211\u4eec\u53ef\u4ee5\u5728 less \u51fd\u6570\u4e2d\u6dfb\u52a0\u53e6\u4e00\u4e2a\u95f4\u63a5\u7ea7\u522b<\/p>\n
sort.slice(indices, func(a, b int) bool {\n        return float32(v[indices[a]])\/float32(w[indices[a]]) > float32(v[indices[b]])\/float32(w[indices[b]])\n    })<\/pre>\n<\/p>\n
\u6309\u5b9a\u4e49\u6392\u5e8f\u4f1a\u79fb\u52a8\u60a8\u5728\u5207\u7247\u4e2d\u6392\u5e8f\u7684\u9879\u76ee\uff0c\u4ece\u800c\u66f4\u6539\u5b83\u4eec\u5404\u81ea\u7684\u7d22\u5f15\u3002\u4f46\u662f\uff0c\u60a8\u6ca1\u6709\u79fb\u52a8\u8981\u6392\u5e8f\u7684\u5b9e\u9645\u503c\uff08\u4f4d\u4e8e w<\/code> \u548c v<\/code> \u4e2d\uff09\uff0c\u4ec5\u79fb\u52a8 indices<\/code> \u5207\u7247\u3002<\/p>\n
\u7531\u4e8e indices<\/code> \u5207\u7247\u5305\u542b\u6392\u5e8f\u7684\u201c\u7d22\u5f15\u201d\uff0c\u56e0\u6b64\u60a8\u53ef\u4ee5\u4f7f\u7528\u5b83\u6765\u67e5\u627e\u5b9e\u9645\u503c\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n
sort.slice(indices, func(i, j int) bool {\n    return float64(v[indices[i]])\/float64(w[indices[i]]) > float64(v[indices[j]])\/float64(w[indices[j]])\n})<\/pre>\n<\/p>\n
\u6216\u8005\u60a8\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u7c7b\u578b\u6765\u4e00\u6b21\u5bf9\u6240\u6709 3 \u4e2a\u503c\u8fdb\u884c\u6392\u5e8f\uff0c\u4f8b\u5982\uff1a<\/p>\n
type indexSorter struct {\n    indices, w, v []int\n}\n\nfunc (a indexSorter) Len() int { return len(a.indices) }\nfunc (a indexSorter) Swap(i, j int) {\n    a.indices[i], a.indices[j] = a.indices[j], a.indices[i]\n    a.w[i], a.w[j] = a.w[j], a.w[i]\n    a.v[i], a.v[j] = a.v[j], a.v[i]\n}\nfunc (a indexSorter) Less(i, j int) bool {\n    return float64(a.v[i])\/float64(a.w[i]) > float64(a.v[i])\/float64(a.w[j])\n}<\/pre>\n<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aGo \u4e2d\u6309 v\/w \u5bf9 i \u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591aGolang\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207457","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207457","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207457"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207457\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}