Submission #891892

#	Time	Username	Problem	Language	Result	Execution time	Memory
891892		oblantis	Commuter Pass (JOI18_commuter_pass)	C++17	15 / 100	2032 ms	262144 KiB

commuter_pass

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define all(v) v.begin(), v.end()
#define pb push_back
#define ss second
#define ff first
#define vt vector
using namespace std;
//using namespace __gnu_pbds;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<double, int> pdi;
const ll inf = 1e14 + 10000;
const int mod = 1e9+7;
const int maxn = 1e5 + 12;
vt<pii> g[maxn];
void ope(vll &a, int st){
	a[st] = 0;
	priority_queue<pair<ll, int>, vt<pair<ll, int>>, greater<pair<ll, int>>> pq;
	pq.push({0, st});
	while(!pq.empty()){
		pair<ll, int> nw = pq.top();
		pq.pop();
		if(a[nw.ss] != nw.ff)continue;
		for(auto i : g[nw.ss]){
			if(nw.ff + i.ss < a[i.ff]) {
				a[i.ff] = nw.ff + i.ss;
				pq.push({a[i.ff], i.ff});
			}
		}
	}
}
void solve() {
	int n, m, s, t, u, v;
	cin >> n >> m >> s >> t >> u >> v;
	for(int i = 0; i < m; i++) {
		int a, b, c;
		cin >> a >> b >> c;
		a--, b--;
		g[a].pb({b, c});
		g[b].pb({a, c});
	}
	s--, t--, u--, v--;
	vll a(n, inf), c(n, inf), d(n, inf);
	ope(a, s), ope(c, u), ope(d, v);
	queue<tuple<int, ll, ll>> q;
	q.push({t, c[t], d[t]});
	ll ans = d[u];
	while(!q.empty()){
		tuple<int, ll, ll> nw = q.front();
		ans = min(ans, get<1>(nw) + get<2>(nw));
		q.pop();
		for(auto i : g[get<0>(nw)]){
			if(a[i.ff] + i.ss == a[get<0>(nw)]){
				q.push({i.ff, min(get<1>(nw), c[i.ff]), min(get<2>(nw), d[i.ff])});
			}
		}
	}
	cout << ans;
}
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int times = 1;
	//cin >> times;
	for(int i = 1; i <= times; i++) {
		solve();
	}
	return 0;
}

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