Submission #114859

#	Time	Username	Problem	Language	Result	Execution time	Memory
114859		maruii	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	92 ms	3416 KiB

merchant

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

int N, M, K;
int B[101][1000], S[101][1000], E[101][101], W[101][101];

bool f(ll m) {
	ll X[101][101] = {0};
	for (int i = 1; i <= N; ++i) for (int j = 1; j <= N; ++j) X[i][j] = W[i][j] - m * E[i][j];
	for (int i = 1; i <= N; ++i) for (int j = 1; j <= N; ++j) for (int k = 1; k <= N; ++k) {
		if (j != k) X[j][k] = max(X[j][k], X[j][i] + X[i][k]);
	}
	for (int i = 1; i < N; ++i) for (int j = i + 1; j <= N; ++j) if (X[i][j] + X[j][i] >= 0) return 1;
	return 0;
}

int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> N >> M >> K;
	for (int i = 1; i <= N; ++i) for (int j = 0; j < K; ++j) cin >> B[i][j] >> S[i][j];
	for (int i = 1; i <= N; ++i) fill(E[i] + 1, E[i] + N + 1, 1e9);
	for (int i = 0; i < M; ++i) {
		int a, b, c; cin >> a >> b >> c;
		E[a][b] = c;
	}
	
	for (int x = 1; x <= N; ++x) for (int i = 1; i <= N; ++i) for (int j = 1; j <= N; ++j)
		E[i][j] = min(E[i][j], E[i][x] + E[x][j]);
	for (int i = 1; i <= N; ++i) for (int j = 1; j <= N; ++j) for (int k = 0; k < K; ++k)
		if(S[j][k] > 0 && B[i][k] > 0) W[i][j] = max(W[i][j], S[j][k] - B[i][k]);

	int l = 0, r = 1e9;
	while (l < r) {
		int m = l + r + 1 >> 1;
		if (f(m)) l = m;
		else r = m - 1;
	}
	cout << r;
	return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.cpp:35:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = l + r + 1 >> 1;
           ~~~~~~^~~

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