Submission #963295

#	Time	Username	Problem	Language	Result	Execution time	Memory
963295		TimAni	Bitaro’s Party (JOI18_bitaro)	C++17	7 / 100	2031 ms	76640 KiB

bitaro

//start-time: 2024-04-14 19:39:32
#include <vector>
#include <set>
#include <iostream>
#include <cassert>
#include <algorithm>

using namespace std;
using ll = long long;

const int w = 150;

void solve(){
    int n, m, q;
    cin >> n >> m >> q;

    vector<vector<int>> gR(n);

    for(int i = 0; i < m; i++){
        int u, v;
        cin >> u >> v;
        gR[v - 1].push_back(u - 1);
    }
    
    vector<vector<pair<int, int>>> dp(n);

    for(int u = 0; u < n; u++){
        vector<int> val(n, -1);
        set<pair<int, int>> aux;
        aux.insert({0, u});
        val[u] = 0;

        for(auto &v : gR[u]){
            for(auto &[value, ind] : dp[v]){
                val[ind] = max(val[ind], value + 1);
            }
        }

        for(auto &v : gR[u]){
            for(auto &[value, ind] : dp[v]){
                aux.insert({val[ind], ind});
                if(aux.size() > w){
                    aux.erase(aux.begin());
                }
            }
        }

        dp[u] = vector<pair<int, int>>(aux.begin(), aux.end());
        assert(dp[u].size() <= w);
    }

    while(q--){
        vector<bool> c(n);
        int u, y;
        cin >> u >> y;
        u--;
        for(int j = 0; j < y; j++){
            int a; cin >> a;
            c[--a] = 1;
        }

        int ans = -1;

        if(y < w) {
            for(auto &[v, i] : dp[u]){
                if(!c[i]){
                    ans = max(ans, v);
                }
            }
        }
        else {
            vector<int> naive(n);
            for(int v = 0; v <= u; v++){
                naive[v] = c[v] ? -1 : 0;
                for(auto &el : gR[v]){
                    naive[v] = max(naive[v], naive[el] + (naive[el] != -1));
                }
            }
            ans = naive[u];
        }

        cout << ans << endl;
    }
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    ll T = 1;
    //cin >> T;
    while(T--) solve();
    return 0;
}

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