Submission #200598

#	Time	Username	Problem	Language	Result	Execution time	Memory
200598		Rakhmand	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	92 ms	4600 KiB

merchant

//
//  ROIGold.cpp
//  Main calisma
//
//  Created by Rakhman on 05/02/2019.
//  Copyright © 2019 Rakhman. All rights reserved.
//
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>
#include <iterator>

#define ios ios_base::sync_with_stdio(0), cout.tie(0), cin.tie(0);
#define S second
#define F first
#define pb push_back
#define nl '\n'
#define NL cout << '\n';
#define EX exit(0)
#define all(s) s.begin(), s.end()
#define FOR(i, start, finish, k) for(int i = start; i <= finish; i += k)

const int MXN = 1e5 + 10;
const long long MNN = 1e6 + 200;
const long long MOD = 1e9 + 7;
const long long INF = 1e16;
const int OO = 1e9 + 10;

typedef long long llong;
typedef unsigned long long ullong;

using namespace std;

void istxt(bool yes){
    if(yes == 1){
        freopen("balancing.in", "r", stdin);
        freopen("balancing.out", "w", stdout);
    }else{
        freopen("/Users/rakhmanabdirashov/Desktop/folder/Programming/Road2Master/Road2Master/input.txt", "r", stdin);
    }
}

int n, m, k;
llong b[110][1100], s[110][1100], ans[110][110], u[MXN], v[MXN], cost[MXN], dp[110][110];
llong g[110][110];
llong mx[110][110];

bool check(llong ans){
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            if(g[i][j] == INF){
                dp[i][j] = INF;
            }else{
                dp[i][j] = g[i][j] * ans - mx[i][j];
            }
        }
        dp[i][i] = INF;
    }
    for(int k = 1; k <= n; k++){
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= n; j++){
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k][j]);
            }
        }
    }
    for(int i = 1; i <= n; i++){
        if(dp[i][i] <= 0){
            return true;
        }
    }
    return false;
}

int main () {
    ios;
    //istxt(0);
    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++){
            g[i][j] = INF;
        }
        g[i][i] = 0;
    }
    for(int i = 1; i <= m; i++){
        cin >> u[i] >> v[i] >> cost[i];
        g[u[i]][v[i]] = cost[i];
    }
    for(int k = 1; k <= n; k++){
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= n; j++){
                g[i][j] = min(g[i][j], g[i][k] + g[k][j]);
            }
        }
    }
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= k; j++){
            if(b[i][j] != -1){
                for(int nx = 1; nx <= n; nx++){
                    if(s[nx][j] != -1){
                        mx[i][nx] = max(mx[i][nx], s[nx][j] - b[i][j]);
                    }
                }
            }
        }
    }
    llong l = 0, r = 1e9;
    while(r - l > 1){
        llong  m = (r + l) / 2;
        if(check(m)){
            l = m;
        }else{
            r = m;
        }
    }
    cout << (check(r) ? r : l);
}

Compilation message (stderr)

merchant.cpp: In function 'void istxt(bool)':
merchant.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen("balancing.in", "r", stdin);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen("balancing.out", "w", stdout);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen("/Users/rakhmanabdirashov/Desktop/folder/Programming/Road2Master/Road2Master/input.txt", "r", stdin);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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