Submission #158179

#	Time	Username	Problem	Language	Result	Execution time	Memory
158179		fedoseevtimofey	Bitaro’s Party (JOI18_bitaro)	C++14	7 / 100	54 ms	4396 KiB

bitaro

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = 1e3 + 7;
const int Inf = 1e9;

vector <int> g[N];
vector <int> rg[N];
bool used[N];
int dp[N];

vector <int> ts;

void dfs(int u) {
    used[u] = 1;
    for (int v : g[u]) {
        if (!used[v]) {
            dfs(v);
        }
    }
    ts.push_back(u);
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0); cout.setf(ios::fixed); cout.precision(20);
    #ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif
    int n, m, q;
    cin >> n >> m >> q;
    for (int i = 0; i < m; ++i) {
        int u, v;
        cin >> u >> v;
        --u, --v;
        g[u].push_back(v);
        rg[v].push_back(u);
    }
    for (int i = 0; i < n; ++i) {
        if (!used[i]) {
            dfs(i);
        }
    }
    while (q--) {
        int t;
        cin >> t;
        --t;
        vector <int> ban(n);    
        int y;
        cin >> y;
        for (int i = 0; i < y; ++i) {
            int x;
            cin >> x;
            --x;
            ban[x] = 1;
        }
        fill(dp, dp + n, -Inf);
        dp[t] = 0;
        for (int x : ts) {
            for (int v : g[x]) {
                dp[x] = max(dp[x], dp[v] + 1);
            }
        }
        int ans = -1;
        for (int i = 0; i < n; ++i) if (!ban[i]) ans = max(ans, dp[i]);
        cout << ans << '\n';
    }
}

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