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https://git.sb/baoshuo/OI-codes.git
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46 lines
844 B
C++
46 lines
844 B
C++
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#include <iostream>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 105;
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int n, q, l[N], r[N], a[N], f[N][N];
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std::vector<std::pair<int, int>> g[N];
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void dfs(int u, int fa) {
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for (auto e : g[u]) {
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int v = e.first,
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w = e.second;
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if (v == fa) continue;
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dfs(v, u);
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for (int k = q; k; k--) {
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for (int j = k - 1; j >= 0; j--) {
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f[u][k] = std::max(f[u][k], w + f[u][k - j - 1] + f[v][j]);
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}
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}
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}
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> n >> q;
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for (int i = 1, u, v, w; i < n; i++) {
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cin >> u >> v >> w;
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g[u].push_back(std::make_pair(v, w));
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g[v].push_back(std::make_pair(u, w));
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}
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dfs(1, -1);
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cout << f[1][q] << endl;
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return 0;
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}
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