Submission #1264426

#	Time	Username	Problem	Language	Result	Execution time	Memory
1264426		mingga	Toll (BOI17_toll)	C++20	100 / 100	1613 ms	4828 KiB

toll

// Author: caption_mingle
#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define ll long long
const int mod = 1e9 + 7;
const int inf = 2e9;
const int N = 50005;
int k, n, m, q;
ll f[N];

vector<pair<int, int>> g[N];

signed main() {
	cin.tie(0) -> sync_with_stdio(0);
	#define task ""
	if(fopen(task ".INP", "r")) {
		freopen(task ".INP", "r", stdin);
		freopen(task ".OUT", "w", stdout);
	}
	cin >> k >> n >> m >> q;
	for(int i = 1; i <= m; i++) {
		int a, b, t; cin >> a >> b >> t;
		g[b].pb({a, t});
	}
	for(int i = 1; i <= q; i++) {
		int a, b; cin >> a >> b;
		for(int j = 0; j < n; j++) f[j] = 2e18;
		f[a] = 0;
		for(int j = a + 1; j <= b; j++) {
			for(auto [v, w] : g[j]) {
				f[j] = min(f[j], f[v] + w);
			}
		}
		if(f[b] == 2e18) f[b] = -1;
		cout << f[b] << ln;
	}
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:25:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:26:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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