Submission #864527

#	Time	Username	Problem	Language	Result	Execution time	Memory
864527		maks007	Toll (BOI17_toll)	C++14	10 / 100	118 ms	6844 KiB

toll

// Bismi ALlah
#include "bits/stdc++.h"

using namespace std;

#define int long long

signed main () {
	int n, m, k, query;
	cin >> k >> n >> m >> query;
	vector<pair <int,int>> g[n];
	for(int i = 0; i < m; i ++) {
		int u, v;
		cin >> u >> v;
		int w;
		cin >> w;
		g[u].push_back({v, w});
	}
	int dp[n][k];
	for(int i = 0; i < n; i ++) {
		for(int j = 0; j < k; j ++) dp[i][j] = LLONG_MAX;
	}
	for(int j = 0; j < k; j ++) {
		dp[j][j] = 0;
		for(int i = 0; i < n; i ++) {
			if(dp[i][j] != LLONG_MAX) {
				for(auto [u, w] : g[i]) {
					dp[u][j] = min(dp[u][j], dp[i][j] + w);
				}
			}
		}
	}
	while(query --) {
		int a, b;
		cin >> a >> b;
		int mn = LLONG_MAX;
		for(int i = 0; i < k; i ++) {
			if(dp[b][i] == LLONG_MAX || dp[a][i] == LLONG_MAX) continue;
			mn = min(mn, dp[b][i] - dp[a][i]);
		}
		if(mn == LLONG_MAX) cout << -1 << "\n";
		else cout << mn << "\n";
	}
	return 0;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:27:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   27 |     for(auto [u, w] : g[i]) {
      |              ^

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