제출 #230049

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
230049		MetB	여행하는 상인 (APIO17_merchant)	C++14	100 / 100	255 ms	3380 KiB

merchant

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
 
using namespace __gnu_pbds;
 
#define N 2000003
 
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
 
const ll INF = 1e18, MOD = 1e9 + 7, MOD2 = 1e6 + 3;

ll un_dist[200][200], deal[200][200];
ll sell[200][2000], buy[200][2000], n, m, k;
ll d[200][200];

bool check (ll x) {

	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++) {
			if (un_dist[i][j] == INF) d[i][j] = -INF;
			else {
				d[i][j] = deal[i][j] - x * un_dist[i][j];
			}
			d[i][j] = max (d[i][j], -INF);
		}


	for (int k = 0; k < n; k++)
		for (int i = 0; i < n; i++)
			for (int j = 0; j < n; j++)
				if (d[i][j] < d[i][k] + d[k][j]) d[i][j] = d[i][k] + d[k][j];

	for (int i = 0; i < n; i++)
		if (d[i][i] >= 0) return true;
	if (!x) return true;

	return false;
}
 
int main () {
	cin >> n >> m >> k;

	for (int i = 0; i < n; i++)
		for (int j = 0; j < k; j++) {
			cin >> buy[i][j] >> sell[i][j];
		}

	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++)
			for (int it = 0; it < k; it++) {
				if (sell[j][it] == -1 || buy[i][it] == -1) continue;
				deal[i][j] = max (deal[i][j], sell[j][it] - buy[i][it]);
			}

	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++)
			un_dist[i][j] = INF;

	for (int i = 0; i < m; i++) {
		ll u, v, l;
		cin >> u >> v >> l;
		u--, v--;
		un_dist[u][v] = l;
	}

	for (int k = 0; k < n; k++) 
		for (int i = 0; i < n; i++)
			for (int j = 0; j < n; j++)
				un_dist[i][j] = min (un_dist[i][j], un_dist[i][k] + un_dist[k][j]);

	ll l = 0, r = 1e9 + 10;

	while (l < r) {
		ll mid = (l + r + 1) / 2;
		if (check (mid)) l = mid;
		else r = mid - 1;
	}

	cout << l << endl;
}

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