Submission #1016968

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016968		ThommyDB	Bitaro’s Party (JOI18_bitaro)	C++17	7 / 100	226 ms	524288 KiB

bitaro

#include<bits/stdc++.h>

using namespace std;

int N, M, Q;
vector<pair<int, int>> Canals;
vector<vector<int>> adj;
vector<int> T, Y;
vector<vector<int>> C;
vector<vector<int>> dp;

void dfs(int x){
    if(dp[x][x]==0)return;
    dp[x][x]=0;
    for(auto u : adj[x]){
        dfs(u);
        dp[x][u]= max(dp[x][u], 1);
        for(int i = x+1; i < N; i++){
            if(dp[u][i]==-1)continue;
            dp[x][i] = max(dp[x][i], dp[u][i]+1);
        }
    }
}

signed main(){
    cin >> N >> M >> Q;
    Canals.resize(M);
    adj.resize(N);
    dp.resize(N, vector<int>(N, -1));
    for(int i = 0; i < M; i++){
        cin >> Canals[i].first >> Canals[i].second;
        Canals[i].first--; Canals[i].second--;
        adj[Canals[i].first].push_back(Canals[i].second);
    }
    for(int i = 0; i < N; i++){
        if(dp[i][i]!=-1)continue;
        dfs(i);
    }
    

    /*for(int i = 0; i < N; i++){
        for(int j = 0; j < N; j++){
            cout << i << " -> " << j << " = " << dp[i][j] << "\n";
        }
    }*/

    T.resize(Q);
    Y.resize(Q);
    C.resize(Q);
    vector<bool> TooBusy(N, false);
    for(int i = 0; i < Q; i++){
        fill(TooBusy.begin(), TooBusy.end(), false);
        cin >> T[i] >> Y[i];
        T[i]--;
        C[i].resize(Y[i]);
        for(int j = 0; j < Y[i]; j++){
            cin >> C[i][j];
            C[i][j]--;
            TooBusy[C[i][j]]=true;
        }
        int ans = -1;
        for(int j = 0; j < N; j++){
            //cout << i << " && " << T[i] << "\n";
            if(TooBusy[j])continue;
            ans = max(ans, dp[j][T[i]]);
        }
        cout << ans << "\n";
    }
}

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