Submission #147798

#	Time	Username	Problem	Language	Result	Execution time	Memory
147798		HellAngel	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	121 ms	4216 KiB

merchant

#include <bits/stdc++.h>
#define int long long
const int maxn = 100 + 7;
const int maxk = 1e3 + 7;
const int Inf = 1e18;
using namespace std;

int dist[maxn][maxn], b[maxn][maxk], s[maxn][maxk], n, m, k, cost[maxn][maxn], gau[maxn][maxn];

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin), freopen("test.out", "w", stdout);
    fill_n(&dist[0][0], maxn * maxn, Inf);
    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];
        dist[i][i] = 0;
    }
    for(int i = 1; i <= m; i++)
    {
        int u, v, c;
        cin >> u >> v >> c;
        dist[u][v] = min(dist[u][v], c);
    }
    for(int k = 1; k <= n ; k++)
    {
        for(int i = 1; i <= n; i++)
        {
            for(int j = 1; j <= n; j++)
            {
                int gau = dist[i][k] + dist[k][j];
                gau = min(gau, Inf);
                gau = max(gau, -Inf);
                dist[i][j] = min(dist[i][j], gau);
            }
        }
    }
    for(int i = 1; i <= n; i++)
    {
        for(int j = 1; j <= n; j++)
        {
            for(int type = 1; type <= k; type++)
            {
                if(s[i][type] == -1 || b[j][type] == -1) continue;
                cost[j][i] = max(cost[j][i], s[i][type] - b[j][type]);
            }
        }
    }
    int l = 0;
    int r = 1e9;
    while(l <= r)
    {
        int mid = l + r >> 1;
        /// check(mid)
        for(int i = 1; i <= n; i++)
        {
            for(int j = 1; j <= n; j++)
            {
                if(dist[i][j] != Inf)
                gau[i][j] = mid * dist[i][j] - cost[i][j];
                else
                gau[i][j] = Inf;
            }
        }
        for(int k = 1; k <= n; k++)
        {
            for(int i = 1; i <= n; i++)
            {
                for(int j = 1; j <= n; j++)
                {
                    int meo =gau[i][k] + gau[k][j];
                    meo = max(meo, -Inf);
                    meo = min(meo, Inf);
                    gau[i][j] = min(gau[i][j], meo);
                }
            }
        }
        bool cac = false;
        for(int i = 1; i <= n; i++)
        {
            for(int j = 1; j <= n; j++)
            {
                if(i == j) continue;
                if(gau[i][j] + gau[j][i] <= 0) cac = true;
            }
        }
        if(cac) l = mid + 1;
        else r = mid - 1;
    }
    cout << r;
}

Compilation message (stderr)

merchant.cpp: In function 'int32_t main()':
merchant.cpp:56:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid = l + r >> 1;
                   ~~^~~
merchant.cpp:14:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin), freopen("test.out", "w", stdout);
                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:14:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]

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