Submission #57075

#	Time	Username	Problem	Language	Result	Execution time	Memory
57075		Xellos	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	894 ms	14504 KiB

merchant

#include <bits/stdc++.h>
// iostream is too mainstream
#include <cstdio>
// bitch please
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <cmath>
#include <iomanip>
#include <time.h>
#define dibs reserve
#define OVER9000 1234567890
#define ALL_THE(CAKE,LIE) for(auto LIE =CAKE.begin(); LIE != CAKE.end(); LIE++)
#define tisic 47
#define soclose 1e-8
#define chocolate win
// so much chocolate
#define patkan 9
#define ff first
#define ss second
#define abs(x) ((x < 0)?-(x):x)
#define uint unsigned int
#define dbl long double
#define pi 3.14159265358979323846
using namespace std;
// mylittledoge

typedef long long cat;

#ifdef DONLINE_JUDGE
	// palindromic tree is better than splay tree!
	#define lld I64d
#endif

int main() {
	cin.sync_with_stdio(0);
	cin.tie(0);
	cout << fixed << setprecision(10);
	int N,M,K;
	cin >> N >> M >> K;
	vector< vector<cat> > B(N,vector<cat>(K)), S(N,vector<cat>(K));
	for(int i =0; i < N; i++) for(int j =0; j < K; j++) cin >> B[i][j] >> S[i][j];
	vector< vector<cat> > D(N,vector<cat>(N,1e18));
	for(int i =0; i < N; i++) D[i][i] =0;
	for(int i =0; i < M; i++) {
		int a,b,c;
		cin >> a >> b >> c;
		D[a-1][b-1] =min(D[a-1][b-1],1LL*c);}
	for(int k =0; k < N; k++)
		for(int i =0; i < N; i++) for(int j =0; j < N; j++)
			D[i][j] =min(D[i][j],D[i][k]+D[k][j]);
	vector< vector<cat> > gain(N,vector<cat>(N,0));
	for(int i =0; i < N; i++) for(int k =0; k < K; k++) if(B[i][k] != -1)
		for(int j =0; j < N; j++) if(S[j][k] > B[i][k]) gain[i][j] =max(gain[i][j],S[j][k]-B[i][k]);

	cat ansA =0, ansB =OVER9000;
	while(ansB-ansA > 1) {
		int r =(ansA+ansB)/2;
		vector< vector<cat> > cost(N,vector<cat>(N,-1e18));
		for(int i =0; i < N; i++) for(int j =0; j < N; j++) 
			if(D[i][j] < 1e10) cost[i][j] =gain[i][j]-r*D[i][j];
		for(int a =0; a < 10; a++) {
			bool br =false;
			for(int i =0; i < N; i++) for(int j =0; j < N; j++) if(i != j)
				if(cost[i][j]+cost[j][i] >= 0) br =true;
			if(br) break;
			vector< vector<cat> > cost_nw =cost;
			for(int i =0; i < N; i++) for(int j =0; j < N; j++) if(D[i][j] < 1e10)
				for(int k =0; k < N; k++) if(D[j][k] < 1e10) 
					cost_nw[i][k] =max(cost_nw[i][k],cost[i][j]+cost[j][k]);
			cost =cost_nw;}
		bool ok =false;
		for(int i =0; i < N; i++) for(int j =0; j < N; j++) if(i != j)
			if(cost[i][j]+cost[j][i] >= 0) ok =true;
		if(ok) ansA =r;
		else ansB =r;}
	cout << ansA << "\n";
	return 0;}

// look at my code
// my code is amazing

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