제출 #1094849

#제출 시각아이디문제언어결과실행 시간메모리
1094849TrinhKhanhDungCommuter Pass (JOI18_commuter_pass)C++14
16 / 100
152 ms18300 KiB
#include <bits/stdc++.h> #define ll long long #define fi first #define se second #define sz(x) (int)x.size() #define ALL(v) v.begin(),v.end() #define MASK(k) (1LL << (k)) #define BIT(x, i) (((x) >> (i)) & 1) #define oo (ll)1e18 #define INF (ll)1e9 #define MOD (ll)(1e9 + 7) using namespace std; template<class T1, class T2> bool maximize(T1 &a, T2 b){if(a < b){a = b; return true;} return false;} template<class T1, class T2> bool minimize(T1 &a, T2 b){if(a > b){a = b; return true;} return false;} template<class T1, class T2> void add(T1 &a, T2 b){a += b; if(a >= MOD) a -= MOD;} template<class T1, class T2> void sub(T1 &a, T2 b){a -= b; if(a < 0) a += MOD;} template<class T> void cps(T &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());} const int MAX_N = 1e5 + 10; int N, M, S, T, U, V; ll distS[MAX_N], distU[MAX_N], distV[MAX_N], minCostU[MAX_N], minCostV[MAX_N]; vector<pair<int, int>> adj[MAX_N]; bool visited[MAX_N]; void dijkstra(ll dist[], int s){ memset(dist, 0x3f, (N + 3) * sizeof(ll)); dist[s] = 0; priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>> pq; pq.push(make_pair(0, s)); while(!pq.empty()){ int u = pq.top().se; ll kc = pq.top().fi; pq.pop(); if(kc > dist[u]) continue; for(pair<int, int> o: adj[u]){ int v = o.fi; ll newkc = kc + o.se; if(minimize(dist[v], newkc)){ pq.push(make_pair(newkc, v)); } } } } void solve(){ cin >> N >> M >> S >> T >> U >> V; for(int i = 1; i <= M; i++){ int u, v, c; cin >> u >> v >> c; adj[u].push_back(make_pair(v, c)); adj[v].push_back(make_pair(u, c)); } dijkstra(distS, S); dijkstra(distU, U); dijkstra(distV, V); memset(minCostU, 0x3f, sizeof minCostU); memset(minCostV, 0x3f, sizeof minCostV); priority_queue<pair<ll, int>> pq; pq.push(make_pair(distS[T], T)); minCostU[T] = distU[T]; minCostV[T] = distV[T]; visited[T] = true; ll ans = oo; while(!pq.empty()){ int u = pq.top().se; pq.pop(); minCostU[u] = distU[u]; minCostV[u] = distV[u]; for(pair<int, int> o: adj[u]){ int v = o.fi, kc = o.se; if(!visited[v] && distS[u] == distS[v] + kc){ visited[v] = true; pq.push(make_pair(distS[v], v)); } if(distS[u] + kc == distS[v]){ minimize(minCostU[u], minCostU[v]); minimize(minCostV[u], minCostV[v]); } } minimize(ans, distU[u] + minCostV[u]); minimize(ans, distV[u] + minCostU[u]); } cout << ans << '\n'; } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); // freopen("capsomayman.inp","r",stdin); // freopen("capsomayman.out","w",stdout); int t = 1; // cin >> t; while(t--){ solve(); } return 0; }
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