Submission #1230521

#TimeUsernameProblemLanguageResultExecution timeMemory
1230521zut3경주 (Race) (IOI11_race)C++20
9 / 100
159 ms38980 KiB
#include "race.h" #include<bits/stdc++.h> using namespace std; int n, k; vector<vector<pair<int, int>>> g; vector<map<int, int>> d; int mn = 2e9; bool have_ans = false; void dfs(int v, int prev) { for(auto [u, w]: g[v]) { if(prev == u) continue; dfs(u, v); d[v][w] = 1; for(int i = w+1; i <= k; i++) { if(!d[u].count(i-w)) continue; if(d[v].count(i)) d[v][i] = min(d[v][i], d[u][i-w]+1); else d[v][i] = d[u][i-w]+1; } } if(d[v].count(k)) { mn = min(mn, d[v][k]); have_ans = true; } } int best_path(int N, int K, int H[][2], int L[]) { n = N; k = K; g.assign(n, vector<pair<int, int>>()); d.assign(n, map<int, int>()); 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]}); } dfs(0, -1); if(have_ans) return mn; return -1; }
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