Submission #852902

#	Time	Username	Problem	Language	Result	Execution time	Memory
852902		Anonymous_Guys	Commuter Pass (JOI18_commuter_pass)	C++17	0 / 100	101 ms	16068 KiB

commuter_pass

#include <bits/stdc++.h>

using namespace std;
#define pb push_back
#define ii pair<int, int>
#define ll long long
#define int long long
#define fi first
#define se second
#define fou(i, a, b) for (int i = a; i <= b; ++i)
#define all(v) (v).begin(), (v).end()
#define el '\n'
#define MASK(x) (1LL << (x))
#define BIT(mask, x) (((mask) >> (i)) & 1)

const int mxN = 1e5 + 9;
const int MOD =(int)1e9 + 7;
const int INF =(int)1e9;

int d[mxN];
vector<ii> adj[mxN];

void dijsktra(int s) {
    memset(d, 0x3f, sizeof d);
    d[s] = 0;
    priority_queue<ii, vector<ii>, greater<ii> > q;
    q.push({0, s});
    while(!q.empty()) {
        int u = q.top().se;
        int kc = q.top().fi;
        q.pop();
        if (d[u] != kc) continue;
        for (auto it : adj[u]) {
            int v = it.fi;
            int w = it.se;
            if (d[v] > d[u] + w) {
                d[v] = d[u] + w;
                q.push({d[v], v});
            }
        }
    }
}
signed main() {
    if (fopen("GIAOPIZZA.INP", "r")) {
        freopen("GIAOPIZZA.INP", "r", stdin);
        freopen("GIAOPIZZA.OUT", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int n,m ; cin >> n >> m;
    int tram_S, tram_T; cin >> tram_S >> tram_T;
    int tram_U, tram_V; cin >> tram_U >> tram_V;

    fou(i, 1, m) {
        int u, v, w; cin >> u >> v >> w;
        adj[u].pb({v, w});
        adj[v].pb({u, w});
    }

    dijsktra(tram_U);
    cout << d[tram_V];
    return 0;
}

Compilation message (stderr)

commuter_pass.cpp: In function 'int main()':
commuter_pass.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen("GIAOPIZZA.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
commuter_pass.cpp:46:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         freopen("GIAOPIZZA.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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