Submission #1274039

#TimeUsernameProblemLanguageResultExecution timeMemory
1274039crispxxCommuter Pass (JOI18_commuter_pass)C++20
0 / 100
147 ms327680 KiB
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define all(x) x.begin(), x.end()
#define pb push_back
#define ar array
#define nl '\n'

template <typename A, typename B>
bool chmin(A &a, const B &b) {
	if(a > b) {
		return a = b, true;
	}
	return false;
}

template <typename A, typename B>
bool chmax(A &a, const B &b) {
	if(a < b) {
		return a = b, true;
	}
	return false;
}

const int inf = 1e18;

void solve() {
	int n, m; cin >> n >> m;
	
	int S, T, U, V; cin >> S >> T >> U >> V;
	S--, T--, U--, V--;
	
	vector<vector<ar<int, 2>>> adj(n);
	vector<vector<int>> d(n, vector<int>(n, inf));
	
	for(int i = 0; i < n; i++) d[i][i] = 0;
	
	for(int i = 0; i < m; i++) {
		int u, v, w; cin >> u >> v >> w;
		u--, v--;
		adj[u].pb({v, w});
		adj[v].pb({u, w});
		chmin(d[u][v], w);
		chmin(d[v][u], w);
	}
	
	for(int k = 0; k < n; k++) {
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < n; j++) {
				if(d[i][k] < inf && d[k][j] < inf) {
					chmin(d[i][j], d[i][k] + d[k][j]);
				}
			}
		}
	}
	
	int ans = d[U][V];
	
	// cout << d[S][T] << nl;
	// cout << d[U][V] << nl;
	
	for(int i = 0; i < n; i++) {
		for(int j = 0; j < n; j++) {
			if( (d[S][i] + d[i][j] + d[j][T] == d[S][T]) || (d[S][j] + d[i][j] + d[i][T] == d[S][T]) ) {
				chmin(ans, d[U][i] + d[j][V]);
				chmin(ans, d[U][j] + d[i][V]);
				// cout << i + 1 << ' ' << j + 1 << ' ' << d[U][i] + d[j][V] << nl;
			}
		}
	}
	
	cout << ans << nl;
	
	// vector<ar<int, 4>> d(n, {inf, inf, inf, inf});
	// vector<int> p(n);
	
	// auto D = [&](int s, int j) -> void {
		// d[s][j] = 0;
		// p[s] = -1;
		
		// priority_queue<ar<int, 2>, vector<ar<int, 2>>, greater<>> pq;
		// pq.push({0, s});
		
		// while(!pq.empty()) {
			// auto [d_v, v] = pq.top();
			// pq.pop();
			
			// if(d_v != d[v][j]) continue;
			
			// for(auto [to, w] : adj[v]) {
				// if( chmin(d[to][j], d_v + w) ) {
					// pq.push({d[to][j], to});
					// p[to] = v;
				// }
			// }
		// }
	// };
	
	// D(U, 0), D(V, 1), D(S, 2);
	
	// vector<int> path;
	
	// for(auto v = T; v != -1; v = p[v]) {
		// path.pb(v);
	// }
	
	// int ans1 = inf, ans2 = inf;
	
	// for(auto &x : path) {
		// chmin(ans1, d[x][0]);
		// chmin(ans2, d[x][1]);
	// }
	
	// int ans = d[V][0];
		
	// chmin(ans, ans1 + ans2);
	
	// cout << ans << nl;
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	solve();
}
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