제출 #851917

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
851917		stdfloat	Commuter Pass (JOI18_commuter_pass)	C++17	31 / 100	278 ms	15296 KiB

commuter_pass

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

using ll = long long;

pair<ll, ll> y;

int n, m, s, t, u, v, a, b, c, x;

vector<bool> vis;

vector<ll> dis, diss, dist, disu, disv;

int main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);

	cin >> n >> m >> s >> t >> u >> v;

	vector<pair<int, int>> E[n + 1];
	while (m--) {
		cin >> a >> b >> c;
		E[a].push_back({b, c});
		E[b].push_back({a, c});
	}

	auto f = [&](int st) -> vector<ll>{
		dis.assign(n + 1, LLONG_MAX); dis[st] = 0;
		priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<>> q; q.push({0, st});
		while (!q.empty()) {
			x = q.top().second; q.pop();
			for (auto i : E[x]) {
				if (dis[x] + i.second < dis[i.first]) {
					dis[i.first] = dis[x] + i.second;
					q.push({dis[i.first], i.first});
				}
			}
		}
		return dis;
	};

	diss = f(s); dist = f(t);
	disu = f(u); disv = f(v);

	ll ans = disu[v];
	vis.assign(n + 1, false);
	priority_queue<pair<ll, pair<int, pair<ll, ll>>>, vector<pair<ll, pair<int, pair<ll, ll>>>>, greater<>> q;
	q.push({0, {s, {disu[s], disv[s]}}});
	while (!q.empty()) {
		x = q.top().second.first;
		y = q.top().second.second; q.pop();
		if (x == t) {
			ans = min(ans, y.first + y.second);
			continue;
		}
		if (vis[x]) continue;
		vis[x] = true;
		for (auto i : E[x]) {
			if (diss[x] + i.second == diss[i.first] && diss[i.first] + dist[i.first] == diss[t]) {
				q.push({diss[i.first], {i.first, {min(y.first, disu[i.first]), min(y.second, disv[i.first])}}});
			}
		}
	}

	cout << ans;
}

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