Submission #945330

#	Time	Username	Problem	Language	Result	Execution time	Memory
945330		TAhmed33	Travelling Merchant (APIO17_merchant)	C++98	0 / 100	146 ms	4924 KiB

merchant

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("trapv")
typedef long long ll;
const ll inf = 1e18;
const int MAXN = 100 + 25;
ll s[MAXN][1001], b[MAXN][1001], n, m, k;
ll adj[MAXN][MAXN], adj2[MAXN][MAXN], val[MAXN][MAXN];
bool check (ll x) {
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= n; j++) {
			adj2[i][j] = min(inf / x, adj[i][j]) * x - val[i][j];
		}
	}
	bool flag = 0;
	for (int l = 1; l <= n; l++) {
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j <= n; j++) {
				adj2[i][j] = min(adj2[i][j], adj2[i][l] + adj2[l][j]);
			}
		}
	}
	for (int i = 1; i <= n; i++) flag |= adj2[i][i] < 0ll;
	return !flag;
}
int main () {
	cin >> n >> m >> k;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= k; j++) {
			cin >> b[i][j] >> s[i][j];
		}
	}
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= n; j++) {
			adj[i][j] = inf;	
		}
	}
	while (m--) {
		ll a, b, c; cin >> a >> b >> c;
		adj[a][b] = c;
	}
	for (int l = 1; l <= n; l++) {
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j <= n; j++) {
				adj[i][j] = min(adj[i][j], adj[i][l] + adj[l][j]);
			}
		}
	}
	for (int l = 1; l <= k; l++) {
		for (int i = 1; i <= n; i++) {
			if (b[i][l] == -1) continue;
			for (int j = 1; j <= n; j++) {
				if (s[j][l] != -1) val[i][j] = max(val[i][j], s[j][l] - b[i][l]);
			}
		}
	}
	ll l = 1, r = 1e9, ans = -1;
	while (l <= r) {
		ll mid = (l + r) / 2;
		if (check(mid)) {
			r = mid - 1; ans = mid;
		} else {
			l = mid + 1;
		}
	}
	cout << ans << '\n';
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 21
• Subtask 3: 0 / 33
• Subtask 4: 0 / 34