Submission #720302

#	Time	Username	Problem	Language	Result	Execution time	Memory
720302		Johann	Inside information (BOI21_servers)	C++14	5 / 100	471 ms	524288 KiB

servers

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pii pair<int,int>
#define vb vector<bool>
#define vi vector<int>
#define vpii vector<pii>
#define vvb vector<vb>
#define vvi vector<vi>
#define vvpii vector<vpii>

void dfs(vvpii & adj, int v, int t, int source, vvb & reachable) {
    reachable[source][v] = true;
    for (pii e : adj[v]) {
        if (e.second < t) dfs(adj, e.first, e.second, source, reachable);
    }
}


int main() {
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    int N, K;
    cin >> N >> K;
    vvpii adj(N);
    vvb con(N, vb(N, false));
    for (int i = 0; i < N; ++i) con[i][i] = true;
    for (int t = 1; t < N + K; ++t) {
        string command;
        cin >> command;
        if (command == "S") {
            int a, b;
            cin >> a >> b;
            --a; --b;
            adj[a].push_back({b, t});
            adj[b].push_back({a, t});
            dfs(adj, b, t, a, con);
            dfs(adj, a, t, b, con);
        } else if (command == "Q") {
            int a,d;
            cin >> a >> d;
            --a; --d;
            if (con[a][d]) cout << "yes\n";
            else cout << "no\n";
        } else {
            int d;
            cin >> d;
            --d;
            int cnt = 0;
            for (int i = 0; i < N; ++i) if (con[i][d]) ++cnt;
            cout << cnt << "\n";
        }
    }
}

• Subtask 1: 2.5 / 2.5
• Subtask 2: 2.5 / 2.5
• Subtask 3: 0 / 2.5
• Subtask 4: 0 / 2.5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 12.5
• Subtask 10: 0 / 12.5
• Subtask 11: 0 / 17.5
• Subtask 12: 0 / 17.5