제출 #253008

#제출 시각아이디문제언어결과실행 시간메모리
253008Kubin경주 (Race) (IOI11_race)C++17
21 / 100
3109 ms169080 KiB
#include <bits/stdc++.h> using namespace std; vector<vector<pair<size_t, int>>> graph; const int oo = INT_MAX / 3; int& rd(map<int, int>& m, int key) { auto it = m.find(key); if(it == m.end()) it = m.emplace_hint(it, key, +oo); return it->second; } void mini(map<int, int>& m, int key, int value) { rd(m, key) = min(rd(m, key), value); } void dfs_map_paths(size_t u, int s, int d, map<int, int>& m, size_t glock = SIZE_MAX, size_t lock = SIZE_MAX) { if(d > +oo) return; mini(m, s, d); for(auto [v, w] : graph[u]) if(v != lock and v != glock) dfs_map_paths(v, s + w, d + 1, m, glock, u); } size_t find_centroid(size_t init, size_t lock = SIZE_MAX) { (void)lock; return init; } int solve(size_t init, int k, size_t lock = SIZE_MAX) { auto fix = find_centroid(init, lock); int result = +oo; map<int, int> pre = {{0, 0}}; for(auto [v, w] : graph[fix]) if(v != lock) { map<int, int> cur; dfs_map_paths(v, w, 1, cur, fix); for(auto [s, d] : cur) result = min(result, d + rd(pre, k - s)); for(auto [s, d] : cur) mini(pre, s, d); } for(auto [v, w] : graph[fix]) if(v != lock) result = min(result, solve(v, k, fix)); return result; } int best_path(int _n, int k, int H[][2], int L[]) { const size_t n = _n; graph.resize(n); for(size_t i = 0; i < n - 1; i++) { graph[H[i][0]].emplace_back(H[i][1], L[i]); graph[H[i][1]].emplace_back(H[i][0], L[i]); } int result = solve(0, k); return result >= +oo ? -1 : result; } #ifdef XHOVA #define MAX_N 500000 static int N, K; static int H[MAX_N][2]; static int L[MAX_N]; static int solution; inline void my_assert(int e) {if (!e) abort();} void read_input() { int i; my_assert(2==scanf("%d %d",&N,&K)); for(i=0; i<N-1; i++) my_assert(3==scanf("%d %d %d",&H[i][0],&H[i][1],&L[i])); my_assert(1==scanf("%d",&solution)); } int main() { int ans; read_input(); ans = best_path(N,K,H,L); if(ans==solution) printf("Correct.\n"); else printf("Incorrect. Returned %d, Expected %d.\n",ans,solution); return 0; } #endif

컴파일 시 표준 에러 (stderr) 메시지

race.cpp: In function 'int solve(size_t, int, size_t)':
race.cpp:57:19: warning: unused variable 'w' [-Wunused-variable]
     for(auto [v, w] : graph[fix])
                   ^
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