Submission #853912

#	Time	Username	Problem	Language	Result	Execution time	Memory
853912		overwatch9	Bitaro’s Party (JOI18_bitaro)	C++17	14 / 100	2035 ms	12356 KiB

bitaro

#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
using namespace std;
const int maxn = 1e5 + 1;
vector <int> adj[maxn], adjr[maxn];
bool blocked[maxn];
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, m, q;
    cin >> n >> m >> q;
    for (int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        adj[a].push_back(b);
        adjr[b].push_back(a);
    }
    while (q--) {
        int t, y;
        cin >> t >> y;
        fill(blocked, blocked + n + 1, false);
        for (int i = 0; i < y; i++) {
            int x;
            cin >> x;
            blocked[x] = true;
        }
        vector <int> dp(n+1, -1);
        for (int i = 1; i <= n; i++) {
            if (!blocked[i])
                dp[i] = 0;
            for (auto j : adjr[i]) {
                if (dp[j] != -1)
                    dp[i] = max(dp[i], dp[j] + 1);
            }
        }
        cout << dp[t] << '\n';
    }
    
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 86