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43 lines
897 B
43 lines
897 B
#include <bits/stdc++.h>
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using namespace std;
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const int INF = 0x3f3f3f3f;
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const int N = 10010, M = 20010;
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int n;
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int ans;
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int res = INF;
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int st[N];
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// 邻接表
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int e[M], h[N], idx, w[M], ne[M];
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void add(int a, int b, int c = 0) {
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e[idx] = b, ne[idx] = h[a], w[idx] = c, h[a] = idx++;
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}
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void dfs(int u, int sum) {
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st[u] = 1;
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for (int i = h[u]; ~i; i = ne[i]) {
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int j = e[i];
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if (st[j]) continue;
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dfs(j, sum + w[i]);
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}
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if (sum > ans) ans = sum;
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}
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int main() {
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memset(h, -1, sizeof h);
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cin >> n;
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for (int i = 1; i < n; i++) {
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int a, b, c;
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cin >> a >> b >> c;
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add(a, b, c), add(b, a, c);
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}
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for (int i = 1; i <= n; i++) {
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ans = 0;
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memset(st, 0, sizeof st);
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dfs(i, 0);
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res = min(res, ans);
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}
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printf("%d\n", res);
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return 0;
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} |