제출 #636516

#제출 시각아이디문제언어결과실행 시간메모리
636516gun_gan경주 (Race) (IOI11_race)C++17
0 / 100
0 ms340 KiB
#include <bits/stdc++.h> using namespace std; int best_path(int n, int k, int h[][2], int l[]) { vector<pair<int,int>> g[n]; vector<int> deg(n); 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]}); deg[h[i][0]]++; deg[h[i][1]]++; } queue<pair<int,int>> q; vector<vector<int>> dist(n + 1, vector<int>(k + 1, -1)); for(int i = 0; i < n; i++) { q.push({i, 0}); dist[i][0] = 0; } while(!q.empty()) { auto [v, w] = q.front(); q.pop(); for(auto [u, c] : g[v]) { if(w + c <= k && dist[u][w + c] == -1) { dist[u][w + c] = dist[v][w] + 1; q.push({u, w + c}); } } } int ret = 1e9; for(int i = 0; i < n; i++) { if(dist[i][k] != -1) ret = min(ret, dist[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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