Submission #1264795

#	Time	Username	Problem	Language	Result	Execution time	Memory
1264795		Bui_Quoc_Cuong	Toll (BOI17_toll)	C++20	8 / 100	3094 ms	4748 KiB

toll

#include <bits/stdc++.h>
template <class A, class B>
    bool maximize (A &a, const B b){
        if (a < b) {
            a = b;
            return true;
        } return false;
    }
template <class A, class B>
    bool minimize (A &a, const B b) {
        if (a > b) {
            a = b;
            return true;
        } return false;
    }
#define FOR(i, a, b) for(int i = (a); i <= (int)(b); i++)
#define FORD(i, a, b) for(int i = (a); i >= (int)(b); i--)
#define fi first
#define se second
#define pb push_back
#define ALL(A) A.begin(), A.end()
#define BIT(mask,i) ((mask>>(i))&1)
#define ll long long
using namespace std;

int K, N, M, Q;
vector <pair <int, int>> G[50005];

void init(void) {
    cin >> K >> N >> M >> Q;
    FOR(i, 1, M) {
        int u, v, w; cin >> u >> v >> w;
        G[u].push_back({v, w});
    }
}

namespace sub1 {

    void solve() {
        while (Q--) {
            int sour, fin;
            cin >> sour >> fin;
            vector <long long> dist(N + 2, 1e18);
            priority_queue <array <long long, 2>, vector <array <long long, 2>>, greater <array <long long, 2>>> pq;
            pq.push({dist[sour] = 0, sour});
            while (!pq.empty()) {
                int u = pq.top()[1];
                long long cost = pq.top()[0];
                pq.pop();
                if (cost > dist[u]) continue;
                for (auto it : G[u]) {
                    int v = it.fi, w = it.se;
                    if (minimize(dist[v], cost + w)) {
                        pq.push({dist[v], v});
                    }
                }
            }
            cout << (dist[fin] >= 1e18 ? - 1 : dist[fin]) << "\n";
        }
    }
}

void process(void) {
    sub1::solve();
}

int main(void) {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define koa "kieuoanh"
    if (fopen(koa".inp", "r")) {
        freopen(koa".inp", "r", stdin);
        freopen(koa".out", "w", stdout);
    }
    init();
    process();
    return 0;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(koa".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen(koa".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 10
• Subtask 3: 8 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44