Submission #1203685

#	Time	Username	Problem	Language	Result	Execution time	Memory
1203685		andrejikus	Commuter Pass (JOI18_commuter_pass)	C++20	24 / 100	27 ms	2376 KiB

commuter_pass

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) { cerr << to_string(h); if(sizeof...(t)) cerr << ", "; DBG(t...); }
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)

const int N = 303;
const ll inf = 1e18;
vector<pair<int, int>> adj[N];
ll d[N][N];

void solve() {
    int n, m; cin >> n >> m;
    int s, t; cin >> s >> t;
    int u, v; cin >> u >> v;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++) if (i != j) d[i][j] = inf;
    for (int i = 0; i < m; i++) {
        int u, v, c; cin >> u >> v >> c;
        adj[u].push_back({v, c});
        adj[v].push_back({u, c});
        d[u][v] = c;
        d[v][u] = c;
    }
    for (int k = 1; k <= n; k++) {
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n; j++) {
                d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
            }
        }
    }

    ll ans = d[u][v];
    for (int i = 1; i <= n; i++) {
        for (int j = i-1; j >= 1; j--) {
            if (d[s][j] + d[j][i] + d[i][t] != d[s][t] && d[s][i] + d[i][j] + d[j][t] != d[s][t]) continue;
            ans = min(ans, d[u][i] + d[j][v]);
            ans = min(ans, d[u][j] + d[i][v]);
        }
    }

    cout << ans << "\n";
}

signed main() {
    ios::sync_with_stdio(false); cin.tie(0);
	int t=1; //cin >> t;
	while (t--) {
        solve();
	}
}

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