제출 #729106

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
729106		penguin133	Commuter Pass (JOI18_commuter_pass)	C++17	31 / 100	339 ms	22468 KiB

commuter_pass

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int n, m, s, t, u, v;
int dist[300005], dist2[300005], dist3[300005];
vector <pi> adj[100005];

void dijk(int d[], int st){
	priority_queue <pi, vector<pi>, greater<pi> > pq;
	for(int i=1;i<=n;i++)d[i] = 1e18;
	d[st] = 0;
	pq.push({0, st});
	while(!pq.empty()){
		int x = pq.top().fi, y = pq.top().se;
		pq.pop();
		if(d[y] < x)continue;
		for(auto [i, j] : adj[y]){
			if(d[i] > x + j)d[i] = x + j, pq.push({d[i], i});
		}
	}
}


void solve(){
	cin >> n >> m >> s >> t >> u >> v;
	while(m--){
		int a, b, c; cin >> a >> b >> c;
		adj[a].push_back({b, c});
		adj[b].push_back({a, c});
	}
	dijk(dist, s);
	dijk(dist2, t);
	priority_queue <pi, vector <pi>, greater<pi> > pq;
	pq.push({0, u});
	for(int i=1;i<=n;i++)dist3[i] = 1e18;
	dist3[u] = 0;
	while(!pq.empty()){
		int x = pq.top().fi, y = pq.top().se;
		pq.pop();
		if(dist3[y] < x)continue;
		for(auto [i, j] : adj[y]){
			int cst = j;
			if(dist[i] + j + dist2[y] == dist[t] || dist[y] + j + dist2[i] == dist[t])cst = 0;
			if(dist3[i] > x + cst)dist3[i] = x + cst, pq.push({dist3[i], i});
		}
	}
	cout << dist3[v];
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

컴파일 시 표준 에러 (stderr) 메시지

commuter_pass.cpp:60:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   60 | main(){
      | ^~~~

• Subtask 1: 16 / 16
• Subtask 2: 15 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45