Submission #880549

#	Time	Username	Problem	Language	Result	Execution time	Memory
880549		tsumondai	Autobus (COCI22_autobus)	C++14	0 / 70	6 ms	23900 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define foru(i, l, r) for(int i = l; i <= r; i++)
#define ford(i, r, l) for(int i = r; i >= l; i--)
#define __TIME  (1.0 * clock() / CLOCKS_PER_SEC)

typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;
 
const int N = 1e6 + 5;
 
const int oo = 1e9, mod = 1e9 + 7;
 
int n, m, k, q, c[75][75], visited[71];
string s;
vector<ii> adj[N];

// precalc

void process() {
	memset(c, 0x3f, sizeof(c));
	cin >> n >> m;
	foru(i,1,m) {
		int u, v, t; cin >> u >> v >> t;
		c[u][v]=min(c[u][v], t);
	}

	cin >> k >> q;

	k=min(k,n);

	auto sol=c;

	while (k--) {
		auto newsol=sol;
		foru(x,1,n) {
			foru(y,1,n) {
				foru(z,1,n) {
					newsol[x][y]=min(newsol[x][y], sol[x][z]+c[z][y]);
				}
			}
		}
		sol=newsol;
	}

	while (q--) {
		int s, t;
		cin >> s >> t;
		if (s==t) {
			cout << 0 << '\n'; continue;
		}
		if (sol[s][t]>=oo) cout << -1 << '\n'; else cout << sol[s][t] << '\n';
	}

    return;
}

signed main() {
    cin.tie(0)->sync_with_stdio(false);
    //freopen(".inp", "r", stdin);
    //freopen(".out", "w", stdout);
    process();
    cerr << "Time elapsed: " << __TIME << " s.\n";
    return 0;
}

/*
Xét các trường hợp đặc biệt
Kiểm tra lại input/output
Cố gắng trâu
Lật ngược bài toán
Keep calm and get VOI 
Flow:

*/

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