Submission #253324

#	Time	Username	Problem	Language	Result	Execution time	Memory
253324		super_j6	여행하는 상인 (APIO17_merchant)	C++14	0 / 100	196 ms	2300 KiB

merchant

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string.h>
using namespace std;
#define endl '\n'
#define ll long long
#define pi pair<ll, ll>
#define f first
#define s second
 
pi operator+(pi x, pi y){
	return {x.f + y.f, x.s + y.s};
}
 
const int inf = 0x3f3f3f3f;
const int mxn = 100, mxk = 1000;
int n, m, k;
ll a[mxn][mxk][2];
pi g[mxn][mxn], g2[mxn][mxn];
 
ll f(pi p){
	return p.f + p.s;
}
 
bool sol(ll x){
	for(int i = 0; i < n; i++)
	for(int j = 0; j < n; j++){
		g2[i][j] = g[i][j];
		g2[i][j].s *= x;
	}
	for(int l = 0; l < n; l++)
	for(int i = 0; i < n; i++)
	for(int j = 0; j < n; j++){
		if(g2[i][j].s > g2[i][l].s + g2[l][j].s ||
			g2[i][j].s == g2[i][l].s + g2[l][j].s && 
			g2[i][j].f < g2[i][l].f + g2[l][j].f) g2[i][j] = g2[i][l] + g2[l][j];
	}
	for(int i = 0; i < n; i++)
	for(int j = 0; j < n; j++){
		if(g[0][i].s < inf && g[i][0].s < inf && g2[i][i].f >= g2[i][i].s) return 1;
	}
	return 0;
}
 
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> m >> k;
	
	
	for(int i = 0; i < n; i++)
	for(int j = 0; j < k; j++)
	for(int l = 0; l < 2; l++){
		cin >> a[i][j][l];
	}
	
	for(int i = 0; i < n; i++)
	for(int j = 0; j < n; j++){
		g[i][j] = {0, inf};
		for(int l = 0; l < k; l++){
			if(~a[i][l][0] && ~a[j][l][1]) g[i][j].f = max(g[i][j].f, a[j][l][1] - a[i][l][0]);
		}
	}
	
	for(int i = 0; i < m; i++){
		ll u, v, w;
		cin >> u >> v >> w;
		u--, v--;
		g[u][v].s = min(g[u][v].s, w);
	}
	
	for(int l = 0; l < n; l++)
	for(int i = 0; i < n; i++)
	for(int j = 0; j < n; j++){
		g[i][j].s = min(g[i][j].s, g[i][l].s + g[l][j].s);
	}
	/*
	for(int i = 0; i < n; i++)
	for(int j = 0; j < n; j++){
		cout << g[i][j].f << " " << g[i][j].s << " | ";
		if(j == n - 1) cout << endl;
	}
	cout << endl;
	*/
	int l = 1, r = 0x3f3f3f3f;
	while(r - l > 1){
		int mid = (l + r) / 2;
		if(sol(mid)) l = mid;
		else r = mid;
	}
	/*
	sol(l);
	for(int i = 0; i < n; i++)
	for(int j = 0; j < n; j++){
		cout << g2[i][j].f << " " << g2[i][j].s << " | ";
		if(j == n - 1) cout << endl;
	}
	cout << endl;
	*/
	cout << l << endl;
 
	return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'bool sol(long long int)':
merchant.cpp:36:42: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    g2[i][j].s == g2[i][l].s + g2[l][j].s && 
                                          ^

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