{"id":112589,"date":"2026-10-04T02:41:15","date_gmt":"2026-10-03T18:41:15","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/112589.html"},"modified":"2026-10-04T02:41:15","modified_gmt":"2026-10-03T18:41:15","slug":"%e5%8a%a0%e6%9d%83%e6%a0%91%e4%b8%ad%e5%8f%af%e8%bf%9e%e6%8e%a5%e6%9c%8d%e5%8a%a1%e5%99%a8%e8%ae%a1%e6%95%b0%ef%bc%9a%e6%9e%9a%e4%b8%be%e6%a0%b9%e8%8a%82%e7%82%b9-dfs-%e5%ad%90%e6%a0%91%e8%b4%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/112589.html","title":{"rendered":"\u52a0\u6743\u6811\u4e2d\u53ef\u8fde\u63a5\u670d\u52a1\u5668\u8ba1\u6570\uff1a\u679a\u4e3e\u6839\u8282\u70b9 + DFS \u5b50\u6811\u8d21\u732e\u5408\u5e76\uff08codeforces-go \u53cc\u5468\u8d5b 125 C \u9898\u7cbe\u8bb2\uff09"},"content":{"rendered":"<ul class=\"gcb-tag-list\">\n<li><span class=\"gcb-tag\">\u79d1\u5b66\u8ba1\u7b97<\/span><\/li>\n<\/ul>\n<h3 class=\"gcb-project-title\">\u3010\u514d\u8d39\u4e0b\u8f7d\u94fe\u63a5\u3011codeforces-go<\/h3>\n<p class=\"gcb-project-desc\">\u7b97\u6cd5\u7ade\u8d5b\u6a21\u677f\u5e93 by \u7075\u8336\u5c71\u827e\u5e9c &#x1f4ad;&#x1f4a1;&#x1f388;<\/p>\n<p>    <span class=\"gcb-project-addr-label\">\u9879\u76ee\u5730\u5740&#xff1a;<\/span><br \/>\n    <span class=\"gcb-project-addr-link\">https:\/\/gitcode.com\/GitHub_Trending\/co\/codeforces-go<\/span> <\/p>\n<p>  <span class=\"gcb-project-btn\"> <span class=\"gcb-project-btn-main\">\u70b9\u51fb\u67e5\u770b<\/span> <span class=\"gcb-project-btn-sub\">\u514d\u8d39\u4e0b\u8f7d<\/span> <\/span> <\/p>\n<p>\u672c\u6587\u57fa\u4e8e codeforces-go \u4ed3\u5e93\u4e2d LeetCode \u53cc\u5468\u8d5b\u7b2c 125 \u573a C \u9898\u9898\u89e3\u5c55\u5f00&#xff0c;\u5b8c\u6574\u8bb2\u89e3\u300c\u7edf\u8ba1\u52a0\u6743\u6811\u4e2d\u53ef\u8fde\u63a5\u670d\u52a1\u5668\u5bf9\u6570\u300d\u7684 DFS \u679a\u4e3e\u89e3\u6cd5\u3001\u53f6\u5b50\u526a\u679d\u4e0e\u6a21\u8fd0\u7b97\u4e0b\u6c89\u4e24\u79cd\u4f18\u5316&#xff0c;\u5e76\u7ed9\u51fa Python \/ Java \/ C&#043;&#043; \/ Go \u56db\u79cd\u8bed\u8a00\u5b9e\u73b0\u53ca\u590d\u6742\u5ea6\u5206\u6790\u3002\u8bfb\u5b8c\u672c\u6587&#xff0c;\u4f60\u5c06\u638c\u63e1\u4e00\u7c7b\u300c\u4ee5\u6bcf\u4e2a\u8282\u70b9\u4e3a\u6839\u3001\u5408\u5e76\u5b50\u6811\u8d21\u732e\u8ba1\u6570\u300d\u7684\u6811\u5f62\u679a\u4e3e\u5957\u8def&#xff0c;\u5e76\u80fd\u5728 O(n\u00b2) \u65f6\u95f4\u3001O(n) \u7a7a\u95f4\u5185\u72ec\u7acb\u5b9e\u73b0\u8be5\u9898&#xff0c;\u540c\u65f6\u4e86\u89e3\u4ed3\u5e93\u5185\u914d\u5957\u7684\u6d4b\u8bd5\u9a71\u52a8\u6d41\u7a0b\u3002<\/p>\n<h3>\u9898\u76ee\u56de\u987e&#xff1a;\u4ec0\u4e48\u662f\u300c\u53ef\u8fde\u63a5\u670d\u52a1\u5668\u300d<\/h3>\n<p>\u9898\u76ee\u7ed9\u51fa\u4e00\u68f5\u65e0\u5411\u52a0\u6743\u6811&#xff0c;\u5171\u6709 $n$ \u4e2a\u8282\u70b9&#xff08;$n$ \u7b49\u4e8e edges \u6570\u7ec4\u957f\u5ea6\u52a0\u4e00&#xff09;&#xff0c;\u6bcf\u6761\u8fb9\u5e26\u6709\u6743\u503c wt&#xff0c;\u5e76\u7ed9\u5b9a\u6574\u6570 signalSpeed\u3002\u5b9a\u4e49&#xff1a;<\/p>\n<ul>\n<li>\u670d\u52a1\u5668 c \u4e0e\u8282\u70b9 a \u4e4b\u95f4\u8ddd\u79bb\u4e3a\u8def\u5f84\u4e0a\u8fb9\u6743\u4e4b\u548c&#xff1b;<\/li>\n<li>\u82e5\u8be5\u8ddd\u79bb\u80fd\u88ab signalSpeed \u6574\u9664&#xff08;distance % signalSpeed &#061;&#061; 0&#xff09;&#xff0c;\u5219\u79f0\u670d\u52a1\u5668 c \u4e0e a \u53ef\u8fde\u63a5&#xff1b;<\/li>\n<li>\u5bf9\u6bcf\u4e2a\u670d\u52a1\u5668 c&#xff0c;\u8981\u6c42\u7edf\u8ba1\u300c\u53ef\u8fde\u63a5\u670d\u52a1\u5668\u5bf9\u300d(a, b) \u7684\u6570\u91cf&#xff0c;\u5176\u4e2d a \u2260 b&#xff0c;\u4e14 a\u3001b \u5747\u4e0e c \u53ef\u8fde\u63a5&#xff0c;\u4f46 a \u4e0e b \u4e4b\u95f4\u4e0d\u53ef\u76f4\u63a5\u8fde\u63a5&#xff0c;\u4e14\u8def\u5f84\u5fc5\u987b\u7ecf\u8fc7 c\u3002<\/li>\n<\/ul>\n<p>\u7531\u4e8e\u9898\u76ee\u7ed9\u5b9a\u7684\u662f\u6811\u7ed3\u6784&#xff0c;&#034;\u8def\u5f84\u7ecf\u8fc7 c&#034; \u7b49\u4ef7\u4e8e a\u3001b \u5fc5\u987b\u4f4d\u4e8e\u4ee5 c \u4e3a\u6839\u65f6\u4e0d\u540c\u7684\u5b50\u6811\u5206\u652f\u4e2d\u3002\u8fd9\u662f\u5168\u9898\u6700\u5173\u952e\u7684\u7ed3\u6784\u6027\u8d28&#xff0c;\u4e5f\u662f\u4e0b\u6587\u7b97\u6cd5\u7684\u51fa\u53d1\u70b9\u3002<\/p>\n<h3>\u6838\u5fc3\u7b97\u6cd5&#xff1a;\u679a\u4e3e\u6bcf\u4e2a\u670d\u52a1\u5668\u4f5c\u4e3a\u6839&#xff0c;\u5408\u5e76\u5b50\u6811\u8d21\u732e<\/h3>\n<p>\u539f\u6587\u6863\u7ed9\u51fa\u4e00\u4e2a\u975e\u5e38\u76f4\u89c2\u7684\u505a\u6cd5&#xff1a;\u679a\u4e3e\u670d\u52a1\u5668 $c$ \u4f5c\u4e3a\u6811\u7684\u6839&#xff0c;\u5bf9 $c$ \u7684\u6bcf\u4e2a\u90bb\u63a5\u5b50\u6811\u5206\u522b\u505a\u4e00\u6b21 DFS&#xff0c;\u7edf\u8ba1\u8be5\u5b50\u6811\u5185\u6709\u591a\u5c11\u4e2a\u8282\u70b9\u5230 $c$ \u7684\u8ddd\u79bb\u662f signalSpeed \u7684\u500d\u6570&#xff0c;\u5f97\u5230 cnt&#xff1b;\u518d\u628a\u8fd9\u4e9b cnt \u4e24\u4e24\u4e0d\u540c\u5206\u652f\u5730\u7d2f\u4e58\u8fdb\u7b54\u6848\u3002<\/p>\n<p>\u5177\u4f53\u5730&#xff0c;\u7ef4\u62a4\u4e00\u4e2a\u524d\u7f00\u7d2f\u8ba1\u53d8\u91cf s&#xff0c;\u5bf9 c \u7684\u6bcf\u4e00\u4e2a\u90bb\u5c45\u4f9d\u6b21 DFS \u5f97\u5230 cnt&#xff0c;\u90a3\u4e48&#xff1a;<\/p>\n<p>ans[c] &#043;&#061; cnt * s<br \/>\ns &#043;&#061; cnt<\/p>\n<p>\u5176\u4e2d cnt * s \u7684\u542b\u4e49\u662f&#xff1a;\u5f53\u524d\u5206\u652f\u4e2d\u7684\u53ef\u8fde\u63a5\u8282\u70b9\u4e0e\u6b64\u524d\u6240\u6709\u5206\u652f\u4e2d\u7684\u53ef\u8fde\u63a5\u8282\u70b9\u4e24\u4e24\u914d\u5bf9&#xff0c;\u4e14\u6bcf\u5bf9\u8282\u70b9\u5fc5\u7136\u5206\u5c5e\u4e24\u4e2a\u4e0d\u540c\u5206\u652f\u3001\u8def\u5f84\u5fc5\u7136\u7ecf\u8fc7\u6839 c&#xff0c;\u4ece\u800c\u4fdd\u8bc1\u6bcf\u5bf9 (a, b) \u4e92\u4e0d\u53ef\u76f4\u63a5\u8fde\u63a5\u4e14\u6ee1\u8db3\u9898\u610f\u3002s \u7d2f\u52a0\u540e\u8fdb\u5165\u4e0b\u4e00\u4e2a\u5206\u652f&#xff0c;\u5373\u53ef\u4fdd\u8bc1\u4efb\u610f\u4e24\u5206\u652f\u95f4\u7684\u914d\u5bf9\u6070\u597d\u53ea\u88ab\u7edf\u8ba1\u4e00\u6b21\u3002<\/p>\n<p>\u8fd9\u4e00\u601d\u8def\u7684\u6838\u5fc3\u5728\u4e8e DFS \u7684\u8fd4\u56de\u503c\u5b9a\u4e49&#xff1a;<\/p>\n<p>def dfs(x, fa, s):<br \/>\n    # \u4ece\u6839 c \u8d70\u5230\u8282\u70b9 x \u7684\u8ddd\u79bb\u4e3a s<br \/>\n    # \u82e5 s \u80fd\u88ab signalSpeed \u6574\u9664&#xff0c;\u8bf4\u660e\u8282\u70b9 x \u4e0e\u6839 c \u53ef\u8fde\u63a5&#xff0c;\u8d21\u732e 1<br \/>\n    cnt &#061; 0 if s % signalSpeed else 1<br \/>\n    for y, wt in g[x]:<br \/>\n        if y !&#061; fa:  # \u6cbf\u7740\u6811\u5411\u4e0b\u8d70&#xff0c;\u4e0d\u56de\u7236\u8282\u70b9<br \/>\n            cnt &#043;&#061; dfs(y, x, s &#043; wt)<br \/>\n    return cnt<\/p>\n<p>fa&#xff08;\u7236\u8282\u70b9&#xff09;\u53c2\u6570\u7528\u4e8e\u5728\u65e0\u5411\u6811\u4e0a\u9632\u6b62\u56de\u6eaf&#xff0c;\u4fdd\u8bc1 DFS \u53ea\u5728\u5f53\u524d\u5206\u652f\u5185\u90e8\u8ba1\u6570&#xff0c;\u4e0d\u4f1a\u8de8\u5206\u652f\u6cc4\u6f0f\u5230\u5176\u4ed6\u5b50\u6811\u3002<\/p>\n<h3>\u4f18\u5316\u4e00&#xff1a;\u53f6\u5b50\u8282\u70b9\u76f4\u63a5\u8fd4\u56de 0&#xff08;\u526a\u679d&#xff09;<\/h3>\n<p>\u539f\u6587\u6863\u660e\u786e\u6307\u51fa\u4e00\u4e2a\u91cd\u8981\u4f18\u5316&#xff1a;<\/p>\n<p>\u5982\u679c $c$ \u53ea\u6709\u4e00\u4e2a\u90bb\u5c45&#xff0c;\u5219\u7b54\u6848\u4e3a $0$&#xff0c;\u4e0d\u8c03\u7528 dfs\u3002<\/p>\n<p>\u539f\u56e0\u5f88\u76f4\u89c2&#xff1a;\u82e5\u6839 $c$ \u662f\u6811\u7684\u53f6\u5b50&#xff08;\u5ea6\u6570\u4e3a 1&#xff09;&#xff0c;\u5b83\u53ea\u6709\u4e00\u4e2a\u5206\u652f\u3002\u53ef\u8fde\u63a5\u670d\u52a1\u5668\u5bf9\u5fc5\u987b\u5206\u5c5e\u4e24\u4e2a\u4e0d\u540c\u5206\u652f&#xff0c;\u800c\u6b64\u65f6\u4e0d\u5b58\u5728\u7b2c\u4e8c\u4e2a\u5206\u652f&#xff0c;\u6545 ans[c] &#061; 0 \u662f\u786e\u5b9a\u7684&#xff0c;\u65e0\u9700\u8fd0\u884c DFS\u3002<\/p>\n<p>\u539f\u6587\u6863\u8fd8\u8865\u5145\u4e86\u8bba\u6587 [On the number of leaves in a random recursive tree] \u7684\u80cc\u666f&#xff1a;\u5728\u968f\u673a\u9012\u5f52\u6811\u6570\u636e\u4e0b&#xff0c;\u53f6\u5b50\u8282\u70b9\u7ea6\u5360\u4e00\u534a&#xff0c;\u56e0\u6b64\u8fd9\u4e00\u526a\u679d\u5728\u968f\u673a\u6570\u636e\u4e0b\u53ef\u4ee5\u51cf\u5c11\u4e00\u534a\u7684\u8ba1\u7b97\u91cf\u3002\u8fd9\u4e00\u70b9\u5728\u56db\u79cd\u8bed\u8a00\u5b9e\u73b0\u4e2d\u5747\u6709\u4f53\u73b0&#xff0c;\u7edf\u4e00\u5199\u6210&#xff1a;<\/p>\n<p>for i, gi in enumerate(g):<br \/>\n    if len(gi) &#061;&#061; 1:<br \/>\n        continue   # \u53f6\u5b50\u8282\u70b9&#xff0c;\u7b54\u6848\u5fc5\u4e3a 0<\/p>\n<h3>\u4f18\u5316\u4e8c&#xff1a;\u6a21\u8fd0\u7b97\u4e0b\u6c89&#xff08;Python \u5199\u6cd5\u4e8c&#xff09;<\/h3>\n<p>\u7b2c\u4e00\u79cd\u5199\u6cd5\u5728\u6bcf\u4e2a\u8282\u70b9\u5904\u7528 s % signalSpeed \u5224\u65ad\u53ef\u8fde\u63a5\u6027&#xff1b;\u7b2c\u4e8c\u79cd\u5199\u6cd5\u628a\u53d6\u6a21\u8fd0\u7b97\u4e0b\u6c89\u5230 DFS \u8f6c\u79fb\u8fc7\u7a0b\u4e2d&#xff1a;dfs(y, x, (s &#043; wt) % signalSpeed)&#xff0c;\u8fd9\u6837\u6240\u6709\u8def\u5f84\u8ddd\u79bb\u5728\u904d\u5386\u4e2d\u59cb\u7ec8\u4fdd\u6301\u4e3a $[0, signalSpeed)$ \u7684\u4f59\u6570&#xff0c;\u5224\u65ad\u6761\u4ef6\u7b80\u5316\u4e3a s &#061;&#061; 0&#xff0c;\u4e14\u5929\u7136\u907f\u514d\u4e86\u8def\u5f84\u8ddd\u79bb\u6ea2\u51fa\u4e0e\u53d6\u6a21\u8fd0\u7b97\u91cd\u590d\u8ba1\u7b97\u3002<\/p>\n<p>\u540c\u65f6\u8be5\u5199\u6cd5\u501f\u52a9 &#064;cache \u5bf9 (x, fa, s) \u5143\u7ec4\u505a\u8bb0\u5fc6\u5316&#xff0c;\u7531\u4e8e s \u5df2\u88ab\u538b\u7f29\u4e3a\u6a21\u6570\u7a7a\u95f4\u5185\u7684\u4f59\u6570&#xff0c;\u72b6\u6001\u89c4\u6a21\u53ef\u63a7&#xff0c;\u9012\u5f52\u8fc7\u7a0b\u5177\u5907\u590d\u7528\u4ef7\u503c\u3002\u6ce8\u610f\u8fb9\u754c\u7ec6\u8282&#xff1a;\u7b2c\u4e00\u5c42\u9012\u5f52\u4f20\u5165\u7684\u662f wt % signalSpeed&#xff0c;\u786e\u4fdd\u5165\u53e3\u5904\u540c\u6837\u843d\u5728\u6a21\u6570\u7a7a\u95f4\u5185\u3002<\/p>\n<p>&#064;cache<br \/>\ndef dfs(x: int, fa: int, s: int) -&gt; int:<br \/>\n    cnt &#061; 0 if s else 1<br \/>\n    for y, wt in g[x]:<br \/>\n        if y !&#061; fa:<br \/>\n            cnt &#043;&#061; dfs(y, x, (s &#043; wt) % signalSpeed)<br \/>\n    return cnt<\/p>\n<p>ans &#061; [0] * n<br \/>\nfor i, gi in enumerate(g):<br \/>\n    if len(gi) &#061;&#061; 1:<br \/>\n        continue<br \/>\n    s &#061; 0<br \/>\n    for y, wt in gi:<br \/>\n        cnt &#061; dfs(y, i, wt % signalSpeed)<br \/>\n        ans[i] &#043;&#061; cnt * s<br \/>\n        s &#043;&#061; cnt<\/p>\n<h3>\u56db\u79cd\u8bed\u8a00\u5b8c\u6574\u5b9e\u73b0<\/h3>\n<p>\u4ee5\u4e0b\u662f\u539f\u6587\u6863\u7ed9\u51fa\u7684\u56db\u79cd\u8bed\u8a00\u5b9e\u73b0&#xff0c;\u5747\u5df2\u628a\u300c\u53f6\u5b50\u526a\u679d &#043; \u9010\u5206\u652f\u8d21\u732e\u5408\u5e76\u300d\u4e24\u4e2a\u8981\u70b9\u843d\u5b9e\u5230\u4ee3\u7801\u4e2d\u3002<\/p>\n<p>Python \u5199\u6cd5\u4e00&#xff08;\u4e0d\u53d6\u6a21\u3001\u6700\u76f4\u767d\u7684\u7248\u672c&#xff09;&#xff1a;<\/p>\n<p>class Solution:<br \/>\n    def countPairsOfConnectableServers(self, edges: List[List[int]], signalSpeed: int) -&gt; List[int]:<br \/>\n        n &#061; len(edges) &#043; 1<br \/>\n        g &#061; [[] for _ in range(n)]<br \/>\n        for x, y, wt in edges:<br \/>\n            g[x].append((y, wt))<br \/>\n            g[y].append((x, wt))<\/p>\n<p>        def dfs(x: int, fa: int, s: int) -&gt; int:<br \/>\n            cnt &#061; 0 if s % signalSpeed else 1<br \/>\n            for y, wt in g[x]:<br \/>\n                if y !&#061; fa:<br \/>\n                    cnt &#043;&#061; dfs(y, x, s &#043; wt)<br \/>\n            return cnt<\/p>\n<p>        ans &#061; [0] * n<br \/>\n        for i, gi in enumerate(g):<br \/>\n            if len(gi) &#061;&#061; 1:<br \/>\n                continue<br \/>\n            s &#061; 0<br \/>\n            for y, wt in gi:<br \/>\n                cnt &#061; dfs(y, i, wt)<br \/>\n                ans[i] &#043;&#061; cnt * s<br \/>\n                s &#043;&#061; cnt<br \/>\n        return ans<\/p>\n<p>Java \u5b9e\u73b0&#xff08;\u663e\u5f0f\u6784\u5efa\u90bb\u63a5\u8868&#xff0c;dfs \u4ee5\u6210\u5458\u65b9\u6cd5\u9012\u5f52&#xff09;&#xff1a;<\/p>\n<p>class Solution {<br \/>\n    public int[] countPairsOfConnectableServers(int[][] edges, int signalSpeed) {<br \/>\n        int n &#061; edges.length &#043; 1;<br \/>\n        List&lt;int[]&gt;[] g &#061; new ArrayList[n];<br \/>\n        Arrays.setAll(g, i -&gt; new ArrayList&lt;&gt;());<br \/>\n        for (int[] e : edges) {<br \/>\n            int x &#061; e[0];<br \/>\n            int y &#061; e[1];<br \/>\n            int wt &#061; e[2];<br \/>\n            g[x].add(new int[]{y, wt});<br \/>\n            g[y].add(new int[]{x, wt});<br \/>\n        }<\/p>\n<p>        int[] ans &#061; new int[n];<br \/>\n        for (int i &#061; 0; i &lt; n; i&#043;&#043;) {<br \/>\n            if (g[i].size() &#061;&#061; 1) {<br \/>\n                continue;<br \/>\n            }<br \/>\n            int sum &#061; 0;<br \/>\n            for (int[] e : g[i]) {<br \/>\n                int cnt &#061; dfs(e[0], i, e[1], g, signalSpeed);<br \/>\n                ans[i] &#043;&#061; cnt * sum;<br \/>\n                sum &#043;&#061; cnt;<br \/>\n            }<br \/>\n        }<br \/>\n        return ans;<br \/>\n    }<\/p>\n<p>    private int dfs(int x, int fa, int sum, List&lt;int[]&gt;[] g, int signalSpeed) {<br \/>\n        int cnt &#061; sum % signalSpeed &#061;&#061; 0 ? 1 : 0;<br \/>\n        for (int[] e : g[x]) {<br \/>\n            int y &#061; e[0];<br \/>\n            if (y !&#061; fa) {<br \/>\n                cnt &#043;&#061; dfs(y, x, sum &#043; e[1], g, signalSpeed);<br \/>\n            }<br \/>\n        }<br \/>\n        return cnt;<br \/>\n    }<br \/>\n}<\/p>\n<p>C&#043;&#043; \u5b9e\u73b0&#xff08;\u5229\u7528 C&#043;&#043;23 \u9012\u5f52 lambda \u7684 this auto&amp;&amp; \u81ea\u8eab\u5f15\u7528&#xff0c;\u8fb9\u4ee5 pair&lt;int,int&gt; \u5b58\u50a8&#xff09;&#xff1a;<\/p>\n<p>class Solution {<br \/>\npublic:<br \/>\n    vector&lt;int&gt; countPairsOfConnectableServers(vector&lt;vector&lt;int&gt;&gt; &amp;edges, int signalSpeed) {<br \/>\n        int n &#061; edges.size() &#043; 1;<br \/>\n        vector&lt;vector&lt;pair&lt;int, int&gt;&gt;&gt; g(n);<br \/>\n        for (auto &amp;e : edges) {<br \/>\n            int x &#061; e[0], y &#061; e[1], wt &#061; e[2];<br \/>\n            g[x].push_back({y, wt});<br \/>\n            g[y].push_back({x, wt});<br \/>\n        }<\/p>\n<p>        auto dfs &#061; &amp; -&gt; int {<br \/>\n            int cnt &#061; sum % signalSpeed &#061;&#061; 0;<br \/>\n            for (auto &amp;[y, wt] : g[x]) {<br \/>\n                if (y !&#061; fa) {<br \/>\n                    cnt &#043;&#061; dfs(y, x, sum &#043; wt);<br \/>\n                }<br \/>\n            }<br \/>\n            return cnt;<br \/>\n        };<\/p>\n<p>        vector&lt;int&gt; ans(n);<br \/>\n        for (int i &#061; 0; i &lt; n; i&#043;&#043;) {<br \/>\n            if (g[i].size() &#061;&#061; 1) {<br \/>\n                continue;<br \/>\n            }<br \/>\n            int sum &#061; 0;<br \/>\n            for (auto &amp;[y, wt] : g[i]) {<br \/>\n                int cnt &#061; dfs(y, i, wt);<br \/>\n                ans[i] &#043;&#061; cnt * sum;<br \/>\n                sum &#043;&#061; cnt;<br \/>\n            }<br \/>\n        }<br \/>\n        return ans;<br \/>\n    }<br \/>\n};<\/p>\n<p>Go \u5b9e\u73b0&#xff08;\u5373\u4ed3\u5e93\u6e90\u7801 c.go \u7684\u5b8c\u6574\u7248\u672c&#xff0c;\u9012\u5f52\u7528\u95ed\u5305 &#043; \u5916\u90e8\u53d8\u91cf cnt \u7d2f\u8ba1&#xff09;&#xff1a;<\/p>\n<p>func countPairsOfConnectableServers(edges [][]int, signalSpeed int) []int {<br \/>\nn :&#061; len(edges) &#043; 1<br \/>\ntype edge struct{ to, wt int }<br \/>\ng :&#061; make([][]edge, n)<br \/>\nfor _, e :&#061; range edges {<br \/>\nx, y, wt :&#061; e[0], e[1], e[2]<br \/>\ng[x] &#061; append(g[x], edge{y, wt})<br \/>\ng[y] &#061; append(g[y], edge{x, wt})<br \/>\n}<\/p>\n<p>ans :&#061; make([]int, n)<br \/>\nfor i, gi :&#061; range g {<br \/>\nif len(gi) &#061;&#061; 1 {<br \/>\ncontinue<br \/>\n}<br \/>\nvar cnt int<br \/>\nvar dfs func(int, int, int)<br \/>\ndfs &#061; func(x, fa, sum int) {<br \/>\nif sum%signalSpeed &#061;&#061; 0 {<br \/>\ncnt&#043;&#043;<br \/>\n}<br \/>\nfor _, e :&#061; range g[x] {<br \/>\nif e.to !&#061; fa {<br \/>\ndfs(e.to, x, sum&#043;e.wt)<br \/>\n}<br \/>\n}<br \/>\n}<br \/>\nsum :&#061; 0<br \/>\nfor _, e :&#061; range gi {<br \/>\ncnt &#061; 0<br \/>\ndfs(e.to, i, e.wt)<br \/>\nans[i] &#043;&#061; cnt * sum<br \/>\nsum &#043;&#061; cnt<br \/>\n}<br \/>\n}<br \/>\nreturn ans<br \/>\n}<\/p>\n<h3>\u590d\u6742\u5ea6\u5206\u6790<\/h3>\n<ul>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;$\\\\mathcal{O}(n^2)$&#xff0c;\u5176\u4e2d $n$ \u4e3a edges \u7684\u957f\u5ea6\u52a0\u4e00&#xff08;\u5373\u6811\u8282\u70b9\u6570&#xff09;\u3002\u5916\u5c42\u679a\u4e3e\u6bcf\u4e2a\u6839 $c$ \u81f3\u591a $n$ \u6b21&#xff0c;\u6bcf\u6b21\u5bf9\u6574\u68f5\u6811\u505a\u4e00\u6b21 DFS&#xff1b;\u914d\u5408\u53f6\u5b50\u526a\u679d\u540e&#xff0c;\u5b9e\u9645\u8fd0\u884c\u6b21\u6570\u5728\u968f\u673a\u6570\u636e\u4e0b\u53ef\u663e\u8457\u51cf\u5c11&#xff08;\u7ea6\u4e00\u534a\u7684\u6839\u8282\u70b9\u76f4\u63a5\u8df3\u8fc7&#xff09;\u3002<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;$\\\\mathcal{O}(n)$&#xff0c;\u7528\u4e8e\u5b58\u50a8\u90bb\u63a5\u8868 g \u4e0e\u7b54\u6848\u6570\u7ec4 ans&#xff0c;\u9012\u5f52\u6df1\u5ea6\u5728\u6811\u9000\u5316\u4e3a\u94fe\u65f6\u53ef\u8fbe $O(n)$\u3002<\/li>\n<\/ul>\n<h3>\u4ed3\u5e93\u5b9e\u73b0\u4e0e\u6d4b\u8bd5\u9a71\u52a8\u9a8c\u8bc1<\/h3>\n<p>\u672c\u9898\u5728 codeforces-go \u4ed3\u5e93\u4e2d\u4fdd\u7559\u4e86\u5b8c\u6574\u7684\u300c\u6e90\u7801 &#043; \u6d4b\u8bd5 &#043; \u6837\u4f8b\u6570\u636e\u300d\u4e09\u4ef6\u5957&#xff0c;\u8def\u5f84\u4f4d\u4e8e leetcode\/biweekly\/125\/c\/&#xff1a;<\/p>\n<ul>\n<li>\u5b9e\u73b0&#xff1a;c.go \u4e2d\u7684 countPairsOfConnectableServers&#xff0c;\u4e0e\u4e0a\u6587 Go \u7248\u672c\u5b8c\u5168\u4e00\u81f4&#xff1b;<\/li>\n<li>\u6d4b\u8bd5&#xff1a;c_test.go \u901a\u8fc7 testutil.RunLeetCodeFuncWithFile(t, countPairsOfConnectableServers, &#034;c.txt&#034;, 0) \u8bfb\u53d6\u6837\u4f8b\u6587\u4ef6\u9a71\u52a8\u6d4b\u8bd5&#xff1b;<\/li>\n<li>\u6837\u4f8b\u6570\u636e&#xff1a;c.txt \u4ee5\u300c\u8f93\u5165&#xff08;edges \u4e0e signalSpeed \u5404\u4e00\u884c&#xff09;&#043; \u671f\u671b\u8f93\u51fa&#xff08;\u4e00\u884c&#xff09;\u300d\u4e3a\u4e00\u7ec4&#xff0c;\u76ee\u524d\u5305\u542b\u4e24\u7ec4\u7528\u4f8b&#xff1a;<\/li>\n<\/ul>\n<p>[[0,1,1],[1,2,5],[2,3,13],[3,4,9],[4,5,2]]<br \/>\n1<br \/>\n[0,4,6,6,4,0]<\/p>\n<p>[[0,6,3],[6,5,3],[0,3,1],[3,2,7],[3,1,6],[3,4,2]]<br \/>\n3<br \/>\n[2,0,0,0,0,0,2]<\/p>\n<p>\u4ee5\u7b2c\u4e8c\u7ec4\u4e3a\u4f8b&#xff1a;\u8282\u70b9 3 \u4e0e\u8282\u70b9 0\u30011\u30012\u30014 \u7684\u8ddd\u79bb\u5206\u522b\u4e3a 1\u30016\u30017\u30012&#xff0c;signalSpeed &#061; 3 \u65f6\u53ef\u8fde\u63a5\u8282\u70b9\u4e3a 1&#xff08;\u8ddd\u79bb 6&#xff09;\u4e0e 2&#xff08;\u8ddd\u79bb 7 \u53d6\u6a21\u4e0d\u6574\u9664&#xff1f;7%3&#061;1&#xff09;\u2014\u2014\u5b9e\u9645\u53ef\u8fde\u63a5\u7684\u4e3a\u8ddd\u79bb\u53ef\u88ab 3 \u6574\u9664\u7684\u8282\u70b9&#xff0c;\u6700\u7ec8 ans[3] &#061; 2&#xff08;0 \u4e0e 6\u30015 \u5206\u652f\u4e2d\u7684 1 \u548c 2 \u5f62\u6210\u4e24\u5bf9&#xff09;&#xff0c;\u5176\u4f59\u8282\u70b9\u7684\u7b54\u6848\u7b26\u5408\u8f93\u51fa [2,0,0,0,0,0,2]\u3002<\/p>\n<p>\u8fd9\u5957\u6d4b\u8bd5\u57fa\u7840\u8bbe\u65bd\u7531\u4ed3\u5e93\u7684\u6a21\u677f\u751f\u6210\u5668\u7ef4\u62a4&#xff1a;\u6d4b\u8bd5\u6587\u4ef6\u5934\u90e8\u6ce8\u91ca\u6807\u660e &#034;Generated by copypasta\/template\/leetcode\/generator_test.go&#034;&#xff0c;\u5373 generator_test.go \u4e2d\u7684 genLeetCodeTests \u901a\u8fc7 GetBiweeklyContestID \u81ea\u52a8\u5b9a\u4f4d\u53cc\u5468\u8d5b\u76ee\u5f55\u5e76\u6279\u91cf\u751f\u6210\u9898\u76ee\u6d4b\u8bd5&#xff1b;\u800c leetcode.go \u4e2d\u7684 RunLeetCodeFuncWithFile \u8d1f\u8d23\u628a\u6587\u672c\u6837\u4f8b\u6309\u300c\u6bcf fNumIn &#043; fNumOut \u884c\u4e00\u7ec4\u300d\u5207\u5206&#xff0c;\u5e76\u7ecf parseRawArg \u6309\u53cd\u5c04\u7c7b\u578b\u89e3\u6790\u6210\u51fd\u6570\u5165\u53c2&#xff0c;\u968f\u540e\u9010\u4e2a\u7528\u4f8b\u65ad\u8a00\u8f93\u51fa\u3002<\/p>\n<h3>\u5ef6\u4f38\u601d\u8003\u4e0e\u76f8\u4f3c\u9898\u76ee<\/h3>\n<p>\u539f\u6587\u6863\u4e3a\u8be5\u9898\u914d\u5957\u4e86\u8fdb\u9636\u601d\u8003\u9898&#xff1a;<\/p>\n<p>\u5982\u679c $n &#061; 10^5,\\\\ \\\\text{signalSpeed} &#061; 10$&#xff0c;\u4f60\u80fd\u60f3\u51fa\u4e00\u4e2a\u66f4\u5feb\u7684\u505a\u6cd5\u5417&#xff1f;<\/p>\n<p>\u6b64\u65f6 $O(n^2)$ \u7684\u679a\u4e3e\u6839\u8282\u70b9\u65b9\u6848\u4e0d\u518d\u53ef\u884c\u3002\u53ef\u53c2\u8003 Codeforces 791D Bear and Tree Jumps&#xff08;\u6811\u5f62 DP \u6309\u4f59\u6570\u5206\u7c7b\u8ba1\u6570&#xff09;\u7684\u601d\u8def&#xff0c;\u7528\u4e00\u6b21\u5168\u6811 DP \u5904\u7406\u8ddd\u79bb\u6a21 $k$ \u7684\u7edf\u8ba1\u95ee\u9898&#xff0c;\u5c06\u590d\u6742\u5ea6\u964d\u5230 $O(n \\\\cdot \\\\text{signalSpeed})$ \u7ea7\u522b\u2014\u2014\u8fd9\u63d0\u793a\u6211\u4eec&#xff1a;\u5f53\u6a21\u6570\u5f88\u5c0f\u800c $n$ \u5f88\u5927\u65f6&#xff0c;\u4f59\u6570\u7ef4\u5ea6\u53ef\u4ee5\u5145\u5f53 DP \u72b6\u6001\u7684\u4e00\u90e8\u5206&#xff0c;\u4e0e\u672c\u6587\u7b2c\u4e8c\u79cd\u5199\u6cd5\u4e2d\u300c\u628a\u8def\u5f84\u8ddd\u79bb\u538b\u7f29\u5230\u6a21\u6570\u7a7a\u95f4\u300d\u7684\u601d\u8def\u4e00\u8109\u76f8\u627f\u3002<\/p>\n<p>\u539f\u6587\u6863\u8fd8\u7ed9\u51fa\u4e86\u76f8\u4f3c\u9898\u76ee&#xff1a;<\/p>\n<ul>\n<li>LeetCode 2867 \u7edf\u8ba1\u6811\u4e2d\u7684\u5408\u6cd5\u8def\u5f84\u6570\u76ee&#xff1a;\u540c\u6837\u662f\u6811\u4e0a\u7684\u8def\u5f84\u8ba1\u6570\u95ee\u9898&#xff0c;\u53ef\u5728\u6b64\u57fa\u7840\u4e0a\u8fdb\u4e00\u6b65\u7ec3\u4e60\u300c\u6309\u8d28\u6570\u5206\u7c7b &#043; \u5e76\u67e5\u96c6\/DFS \u5408\u5e76\u8d21\u732e\u300d\u7684\u5957\u8def\u3002<\/li>\n<\/ul>\n<p>\u82e5\u9700\u7cfb\u7edf\u5316\u8bad\u7ec3&#xff0c;\u4ed3\u5e93\u7684 leetcode\/SOLUTIONS.md&#xff08;\u7531\u4f5c\u8005\u7ef4\u62a4\u7684\u9898\u89e3\u7cbe\u9009\u7d22\u5f15&#xff09;\u4ee5\u53ca\u539f\u6587\u6863\u9644\u5e26\u7684\u5206\u7c7b\u9898\u5355&#xff08;\u6ed1\u52a8\u7a97\u53e3\u3001\u4e8c\u5206\u3001\u56fe\u8bba\u3001\u52a8\u6001\u89c4\u5212\u3001\u5e38\u7528\u6570\u636e\u7ed3\u6784\u3001\u6570\u5b66\u7b97\u6cd5\u3001\u5b57\u7b26\u4e32\u7b49 12 \u5927\u7c7b&#xff09;\u53ef\u5e2e\u52a9\u6309\u77e5\u8bc6\u70b9\u67e5\u6f0f\u8865\u7f3a\u3002\u7ed3\u5408\u672c\u4ed3\u5e93 README \u63cf\u8ff0\u7684\u9879\u76ee\u5b9a\u4f4d&#xff08;\u7b97\u6cd5\u7ade\u8d5b\u6a21\u677f\u5e93&#xff09;&#xff0c;\u6b64\u7c7b\u9898\u89e3\u6587\u6863\u4e0e copypasta \u6a21\u677f\u3001\u6d4b\u8bd5\u57fa\u5efa\u5171\u540c\u6784\u6210\u4e86\u4ece\u300c\u770b\u61c2\u9898\u89e3\u300d\u5230\u300c\u53ef\u590d\u73b0\u9a8c\u8bc1\u300d\u7684\u5b8c\u6574\u95ed\u73af\u3002<\/p>\n<p>  <img loading=\"lazy\" decoding=\"async\" class=\"gcb-icon-like\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261003184114-6ac14c4ae517e.svg\" alt=\"\" width=\"16\" height=\"16\" \/> <span class=\"gcb-like-text\">\u8d5e<\/span>  <\/p>\n<p>   <span class=\"gcb-share-text\">\u5206\u4eab<\/span>  <\/p>\n<ul class=\"gcb-tag-list\">\n<li><span class=\"gcb-tag\">\u79d1\u5b66\u8ba1\u7b97<\/span><\/li>\n<\/ul>\n<h3 class=\"gcb-project-title\">\u3010\u514d\u8d39\u4e0b\u8f7d\u94fe\u63a5\u3011codeforces-go<\/h3>\n<p class=\"gcb-project-desc\">\u7b97\u6cd5\u7ade\u8d5b\u6a21\u677f\u5e93 by \u7075\u8336\u5c71\u827e\u5e9c &#x1f4ad;&#x1f4a1;&#x1f388;<\/p>\n<p>    <span class=\"gcb-project-addr-label\">\u9879\u76ee\u5730\u5740&#xff1a;<\/span><br \/>\n    <span class=\"gcb-project-addr-link\">https:\/\/gitcode.com\/GitHub_Trending\/co\/codeforces-go<\/span> <\/p>\n<p>  <span class=\"gcb-project-btn\"> <span class=\"gcb-project-btn-main\">\u70b9\u51fb\u67e5\u770b<\/span> <span class=\"gcb-project-btn-sub\">\u514d\u8d39\u4e0b\u8f7d<\/span> <\/span> <\/p>\n<h4 class=\"gcb-related-title\">\u76f8\u5173\u63a8\u8350<\/h4>\n<ul class=\"gcb-related-list\">\n<li class=\"gcb-related-item\">\n<h5 class=\"gcb-related-item-title\"> codeforces-go\u4e2d\u7684\u6811\u7ed3\u6784&#xff1a;\u6811\u7684\u8282\u70b9\u8bbf\u95ee<\/h5>\n<p class=\"gcb-related-item-desc\">codeforces go\u4e2d\u7684\u6811\u7ed3\u6784&#xff1a;\u6811\u7684\u8282\u70b9\u8bbf\u95ee \u8fd8\u5728\u4e3a\u7b97\u6cd5\u7ade\u8d5b\u4e2d\u7684\u6811\u7ed3\u6784\u95ee\u9898\u5934\u75bc\u5417&#xff1f;codeforces 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