제출 #1282388

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1282388		swishy123	여행하는 상인 (APIO17_merchant)	C++20	100 / 100	856 ms	2316 KiB

merchant

#include <bits/stdc++.h>
#define ll long long
#define ld long double

using namespace std;

const int def = 1e6+1;
const int maxk = 18;
const ll inf = 1e18;
const ld eps = 1e-9;

void solve(){
    int n, m, k;
    cin >> n >> m >> k;

    vector<vector<ll>> b(n, vector<ll>(k, 0));
    auto s = b;

    for (int i = 0; i < n; i++){
        for (int j = 0; j < k; j++)
            cin >> b[i][j] >> s[i][j];
    }
    vector<vector<ll>> dp1(n, vector<ll>(n, inf));
    for (int i = 0; i < m; i++){
        ll u, v, w;
        cin >> u >> v >> w;

        u--; v--;
        dp1[u][v] = min(dp1[u][v], w);
    }
    for (int k = 0; k < n; k++) for (int i = 0; i < n; i++) for (int j = 0; j < n; j++)
        dp1[i][j] = min(dp1[i][j], dp1[i][k] + dp1[k][j]);

    ll l = 0, r = 1e9, mid = (l + r + 1) / 2;
    while (l < r){
        vector<vector<ll>> dp2(n, vector<ll>(n, inf));
        for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) for (int u = 0; u < k; u++){
            if (dp1[i][j] == inf || i == j)  
                continue;
            dp2[i][j] = min(dp2[i][j], dp1[i][j] * mid);
            if (b[i][u] == -1 || s[j][u] == -1)
                continue;
            dp2[i][j] = min(dp2[i][j], dp1[i][j] * mid - (s[j][u] - b[i][u]));
        }
        for (int o = 0; o < 2; o++){
            for (int k = 0; k < n; k++) for (int i = 0; i < n; i++) for (int j = 0; j < n; j++)
                dp2[i][j] = min(dp2[i][j], dp2[i][k] + dp2[k][j]);
        }
        bool ok = 0;
        for (int i = 0; i < n; i++){
            if (dp2[i][i] <= 0)  
                ok = 1;
        }
        if (ok)
            l = mid;
        else    
            r = mid - 1;
        mid = (l + r + 1) / 2;
    }
    cout << l;
}

/*
w / dis >= mid
mid * dis - w <= 0

100 / 2 >= 1
200 / 4 >= 1
*/

main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    if (ifstream("input.txt").good()){
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout); 
    }

    int t = 1;
    while (t--){
        solve();
        cout << "\n";
    }
}

컴파일 시 표준 에러 (stderr) 메시지

merchant.cpp:71:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   71 | main(){
      | ^~~~
merchant.cpp: In function 'int main()':
merchant.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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