제출 #416942

#제출 시각아이디문제언어결과실행 시간메모리
416942snasibov05경주 (Race) (IOI11_race)C++14
21 / 100
3055 ms7388 KiB
#include "race.h" #include <vector> using namespace std; #define oo 1000000000 #define pii pair<int, int> #define pb push_back #define f first #define s second int ans = oo; vector<vector<pii>> ed; void dfs(int cur, int pr, int l, int k, int d){ if (l == k) { ans = min(ans, d); return; } for (auto to : ed[cur]){ if (to.f == pr) continue; dfs(to.f, cur, l + to.s, k, d+1); } } int best_path(int n, int k, int h[][2], int l[]){ ed.resize(n); for (int i = 0; i < n - 1; ++i) { ed[h[i][0]].pb({h[i][1], l[i]}); ed[h[i][1]].pb({h[i][0], l[i]}); } for (int i = 0; i < n; ++i){ dfs(i, -1, 0, k, 0); } if (ans == oo) ans = -1; return ans; }
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