제출 #1218326

#제출 시각아이디문제언어결과실행 시간메모리
1218326thimphuCommuter Pass (JOI18_commuter_pass)C++17
100 / 100
158 ms23820 KiB
#include <bits/stdc++.h> #define int long long using namespace std; int n, m, s, t, u, v; void dijkstra(vector<vector<pair<int, int>>>& adj, int ss, vector<int>& dis) { priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq; dis[ss] = 0; pq.push({0, ss}); while (!pq.empty()) { auto [curw, curn] = pq.top(); pq.pop(); if (curw != dis[curn]) continue; for (auto& [nextn, nextw] : adj[curn]) { if (curw + nextw < dis[nextn]) { dis[nextn] = curw + nextw; pq.push({dis[nextn], nextn}); } } } } signed main() { cin.tie(nullptr)->sync_with_stdio(false); cin >> n >> m >> s >> t >> u >> v; s--; t--; u--; v--; vector<vector<pair<int, int>>> adj(n); for (int i = 0; i < m; i++) { int a, b, c; cin >> a >> b >> c; a--; b--; adj[a].push_back({b, c}); adj[b].push_back({a, c}); } vector<int> dis1(n, LLONG_MAX); vector<int> dis2(n, LLONG_MAX); dijkstra(adj, u, dis1); dijkstra(adj, v, dis2); priority_queue<tuple<int, int, int, int, int>, vector<tuple<int, int, int, int, int>>, greater<tuple<int, int, int, int, int>>> pq; vector<pair<int, int>> dis(n, {LLONG_MAX, LLONG_MAX}); dis[s] = {0, dis1[s] + dis2[s]}; pq.push({0, dis1[s] + dis2[s], dis1[s], dis2[s], s}); while (!pq.empty()) { auto [curw, curs, curu, curv, curn] = pq.top(); pq.pop(); if (make_pair(curw, curs) != dis[curn]) continue; for (auto& [nextn, nextw] : adj[curn]) { int nu = min(curu, dis1[nextn]), nv = min(curv, dis2[nextn]); if (curw + nextw < dis[nextn].first) { dis[nextn] = {curw + nextw, nu + nv}; pq.push({dis[nextn].first, nu + nv, nu, nv, nextn}); } else if (curw + nextw == dis[nextn].first and nu + nv < dis[nextn].second) { dis[nextn].second = nu + nv; pq.push({dis[nextn].first, nu + nv, nu, nv, nextn}); } } } cout << min(dis[t].second, dis1[v]); }
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