Submission #198009

#	Time	Username	Problem	Language	Result	Execution time	Memory
198009		stefdasca	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	706 ms	3448 KiB

merchant

#include<bits/stdc++.h>
#define god dimasi5eks
#pragma GCC optimize("O3")
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define mod 1000000007
#define dancila 3.14159265359
#define eps 1e-9

// #define fisier 1

using namespace std;

typedef long long ll;

int n, m, k, buy[102][1002], sell[102][1002], rf[102][102];

int maxdif[102][102];

ll dp[102], dpaux[102];
bool viz[102];
int main()
{

    #ifdef fisier
        ifstream f("input.in");
        ofstream g("output.out");
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> m >> k;
    for(int i = 1; i <= n; ++i)
    {
        for(int j = 1; j <= k; ++j)
            cin >> buy[i][j] >> sell[i][j];
    }
    for(int i = 1; i <= m; ++i)
    {
        int a, b, c;
        cin >> a >> b >> c;
        rf[a][b] = c;
    }
    for(int k = 1; k <= n; ++k)
        for(int i = 1; i <= n; ++i)
            for(int j = 1; j <= n; ++j)
                if(i != j && rf[i][k] && rf[k][j])
                {
                    if(rf[i][j] == 0 || rf[i][j] > rf[i][k] + rf[k][j])
                        rf[i][j] = rf[i][k] + rf[k][j];
                }
    ll ans = 0;
    for(int i = 1; i <= n; ++i)
        for(int j = 1; j <= n; ++j)
            if(i != j && rf[i][j])
            {
                for(int x = 1; x <= k; ++x)
                    if(i != j && buy[i][x] != -1 && sell[j][x] != -1)
                        maxdif[i][j] = max(maxdif[i][j], sell[j][x] - buy[i][x]);
            }
    for(int start = 1; start <= n; ++start)
    {
        memset(dp, 0, sizeof(dp));
        memset(dpaux, 0, sizeof(dpaux));
        memset(viz, 0, sizeof(viz));
        viz[start] = 1;
        for(int i = 1; i <= n+1; ++i)
        {
            for(int j = 1; j <= n; ++j)
                if(viz[j] && (j == start || rf[j][start]))
                    for(int k = 1; k <= n; ++k)
                    {
                        if(j != k && rf[j][k])
                        {
                            if(!viz[k] || dp[k] == 0)
                                dp[k] = (dp[j] + maxdif[j][k]), dpaux[k] = dpaux[j] + rf[j][k], viz[k] = 1;
                            else
                            {
                                double aa = (0.0000 + dp[j] + maxdif[j][k]) / (0.0000 + dpaux[j] + rf[j][k]);
                                double bb = (0.000 + dp[k]) / (0.0000 + dpaux[k]);
                                if(aa >= bb + 1e-8)
                                    viz[k] = 1, dp[k] = (dp[j] + maxdif[j][k]), dpaux[k] = dpaux[j] + rf[j][k];
                            }
                        }
                    }
            if(dpaux[start])
                ans = max(ans, dp[start] / dpaux[start]);
        }
        if(dpaux[start])
            ans = max(ans, dp[start] / dpaux[start]);
    }
    cout << ans;
    return 0;
}

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