Submission #699612

#	Time	Username	Problem	Language	Result	Execution time	Memory
699612		Gital	Autobus (COCI22_autobus)	C++11	0 / 70	3 ms	340 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define endl '\n'
typedef long long ll;
const ll INF = 1e9 + 1;
ll dp[71][71];
ll path[71][71];
bool checked[71];
ll n,m,k,q;
ll a,b,t;
int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for(int i = 0; i < m; i++) {
        cin >> a >> b >> t;
        if(path[a][b] == 0 || path[a][b] > t) path[a][b] = t;
    }
    cin >> k >> q;
    for(int i = 1; i <= n; i++) {
        pair<ll,ll> dist[71];
        for(int j = 0; j <= n; j++) {
            dp[i][j] = -1;
            dist[j].first = LLONG_MAX;
            dist[j].second = LLONG_MAX;
            checked[j] = false;
        }
        dp[i][i] = 0; dist[i].first = 0; dist[i].second = 0;
        while(true) {
            ll minV = LLONG_MAX; ll minIndex = 0;
            for(int j = 1; j <= n; j++) {
                if(!checked[j] && dist[j].second < k && dist[j].first < minV) {
                    minV = dist[j].first;
                    minIndex = j;
                }
            }
            //cout << minIndex << endl;
            if(minIndex == 0) break;
            checked[(int)minIndex] = true;
            //if(dp[i][(int)minIndex].second >= k) continue;
            //cout << dist[(int)minIndex].second << endl;
            for(int j = 1; j <= n; j++) {
                if(path[minIndex][j] != 0) {
                    if(dp[i][j] == -1 || dp[i][j] > path[minIndex][j] + minV) {
                        dp[i][j] = path[minIndex][j] + minV;
                    }
                    if(dist[j].second > dist[(int)minIndex].second + 1) {
                        dist[j].first = path[minIndex][j] + minV;
                        dist[j].second = dist[(int)minIndex].second + 1;
                        checked[j] = false;
                        //cout << dist[(int)minIndex].second << endl;
                    }
                }
            }
        }
    }
    for(int i = 0; i < q; i++) {
        cin >> a >> b;
        cout << dp[a][b] << endl;
    }
    return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 25
• Subtask 4: 0 / 15