Submission #531804

#	Time	Username	Problem	Language	Result	Execution time	Memory
531804		devariaota	Bosses (BOI16_bosses)	C++17	0 / 100	1 ms	312 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll

signed main(){
    cin.tie(0) -> ios_base::sync_with_stdio(0);

    int n;
    cin >> n;
    vector<vector<int>> adj(n, vector<int>());
    for(int i=0;i<n;i++)
    {
        int k;
        cin >> k;
        for(int j=0;j<k;j++)
        {
            int x;
            cin >> x; x--;
            adj[x].push_back(i);
        }
    }
    int mx = 0, r = 0;
    for(int i=0;i<n;i++)
    {
        if(adj[i].size() > mx)
        {
            mx = adj[i].size();
            r = i;
        }
    }
    queue<int> q;
    q.push(r);
    vector<int> g[n]; // real tree
    vector<int> dist(n, -1), child(n);
    dist[r] = 0;
    // cout << "root : " << r << '\n';
    while(!q.empty()){
        int u = q.front(); q.pop();
        for(auto v : adj[u]){
            if(dist[v] == -1)
            {
                g[v].push_back(u);
                child[u]++;
                dist[v] = dist[u] + 1;
                q.push(v);
            }
        }   
    }
    vector<int> d(n, 1);
    vector<bool> vis(n);
    queue<int> q2;
    for(int i=0;i<n;i++)
    {
        if(!child[i])
        {
            q2.push(i);
        }
    }
    while(!q2.empty()){
        int x = q2.front(); q2.pop();
        // cout << x + 1 << " -> " ;
        for(auto i : g[x])
        {   
            // cout << x + 1 << " -> " << i + 1 << '\n';
            q2.push(i);
            d[i] += d[x];
            vis[i] = 1;
        }
    }
    int ans = 0;
    for(int i=0;i<n;i++) ans += d[i];
    cout << ans << '\n';

}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:26:26: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   26 |         if(adj[i].size() > mx)
      |            ~~~~~~~~~~~~~~^~~~

• Subtask 1: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33