제출 #869803

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
869803		Ariadna	여행하는 상인 (APIO17_merchant)	C++14	0 / 100	41 ms	3528 KiB

merchant

#include <bits/stdc++.h>
#define int long long

using namespace std;

vector < vector < pair < int, int > > > adj;
vector < vector < int > > b;
vector < vector < int > > s;
vector < pair < int, vector < int > > > cicles;
vector < bool > visited;

void dfs(int u, int minutes, vector < int >& cicle) {
    visited[u] = true;
    for (pair < int, int > p : adj[u]) {
        int v = p.first, d = p.second;
        if (!visited[v]) {
            cicle.push_back(v);
            dfs(v, minutes + d, cicle);
            cicle.pop_back();
            visited[v] = false;
        } else if (v == 0) {
            cicles.push_back(make_pair(minutes + d, cicle));
        }
    }
}

signed main()
{
    int n, m, k;
    cin >> n >> m >> k;
    b = s = vector < vector < int > >(n, vector < int >(k));
    for (int i = 1; i < n; ++i) {
        for (int j = 0; j < k; ++j) {
            cin >> b[i][j] >> s[i][j];
        }
    }
    
    adj = vector < vector < pair < int, int > > >(n);
    while (m--) {
        int u, v, d;
        cin >> u >> v >> d;
        --u; --v;
        adj[u].push_back(make_pair(v, d));
    }
    
    vector < int > profit(n, 0);
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < k; ++j) {
            if (s[i][j] != -1) profit[i] = max(profit[i], s[i][j] - b[0][j]);
        }
    }
    
    vector < int > cicle = {0};
    visited = vector < bool >(n, false);
    dfs(0, 0, cicle);
    
    int ans = 0;
    for (pair < int, vector < int > > p : cicles) {
        int t = p.first, max_profit = 0;
        for (int i : p.second) {
            max_profit = max(max_profit, profit[i]);
        }
        if (t > 0) ans = max(ans, max_profit / t);
    }
    cout << ans << '\n';

    return 0;
}

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• Subtask 2: 0 / 21
• Subtask 3: 0 / 33
• Subtask 4: 0 / 34