제출 #636492

#제출 시각아이디문제언어결과실행 시간메모리
636492gun_gan경주 (Race) (IOI11_race)C++17
9 / 100
95 ms51508 KiB
#include <bits/stdc++.h> using namespace std; const int N = 2e5 + 5; vector<pair<int,int>> g[N]; int dp[N][105]; void dfs(int v, int p) { for(auto [u, c] : g[v]) { if(u == p) continue; for(int j = 0; j <= 100; j++) { if(j + c <= 100) { dp[u][j + c] = min(dp[u][j + c], dp[v][j] + 1); } } dfs(u, v); } } int best_path(int n, int k, int h[][2], int l[]) { for(int i = 0; i < n - 1; i++) { g[h[i][0]].push_back({h[i][1], l[i]}); g[h[i][1]].push_back({h[i][0], l[i]}); } for(int i = 0; i < n; i++) { for(int j = 1; j <= 100; j++) { dp[i][j] = 1e9; } } dfs(0, -1); int ret = 1e9; for(int i = 0; i < n; i++) ret = min(ret, dp[i][k]); return (ret == 1e9 ? -1 : ret); } // int main() { // int h[11][2], l[11]; // for(int i = 0; i < 10; i++) { // cin >> h[i][0] >> h[i][1]; // } // for(int i = 0; i < 10; i++) { // cin >> l[i]; // } // cout << best_path(11, 12, h, l) << '\n'; // }
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