結果
問題 | No.1488 Max Score of the Tree |
ユーザー |
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提出日時 | 2021-04-23 22:11:04 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 162 ms / 2,000 ms |
コード長 | 1,704 bytes |
コンパイル時間 | 3,457 ms |
コンパイル使用メモリ | 208,848 KB |
最終ジャッジ日時 | 2025-01-20 23:57:24 |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 29 |
ソースコード
#include <bits/stdc++.h>using namespace std;using ll = long long;#define rep(i, srt, end) for (long long i = (srt); i < (long long)(end); i++)using pl = pair<ll,ll>;using tl = tuple<ll,ll,ll>;void chmax(ll &a, ll b) {a = max(a, b);}void solve() {ll n, k;cin >> n >> k;vector<vector<tl>> G(n);vector<ll> weight(n-1);rep(i, 0, n-1) {ll u, v, w;cin >> u >> v >> w;u--; v--;G[u].push_back({v, w, i});G[v].push_back({u, w, i});weight[i] = w;}vector<ll> cnt(n-1, 0), sub(n, 0);auto dfs1 = [&](auto dfs1, ll cur, ll par) -> ll {ll res = 0;bool leaf = true;for(auto [to, cost, id] : G[cur]) {if(to == par) continue;leaf = false;res += dfs1(dfs1, to, cur);cnt[id] += sub[to];}if(leaf) res = 1;sub[cur] = res;return res;};dfs1(dfs1, 0, -1);vector<ll> depth(n, 0);ll sum = 0;auto dfs2 = [&](auto dfs2, ll cur, ll par) -> void {bool leaf = true;for(auto [to, cost, id] : G[cur]) {if(to == par) continue;leaf = false;depth[to] = depth[cur] + cost;dfs2(dfs2, to, cur);}if(leaf) sum += depth[cur];};dfs2(dfs2, 0, -1);vector dp(n+10, vector<ll>(k+100, 0));rep(i, 0, n-1) {rep(j, 0, k+1) chmax(dp[i+1][j], dp[i][j]);rep(j, 0, k) if(j+weight[i] <= k) chmax(dp[i+1][j+weight[i]], dp[i][j]+cnt[i]*weight[i]);}ll ans = 0;rep(i, 0, k+1) chmax(ans, dp[n-1][i]);cout << sum+ans << endl;}int main() {solve();return 0;}