Submission #531825

#	Time	Username	Problem	Language	Result	Execution time	Memory
531825		devariaota	Bosses (BOI16_bosses)	C++17	22 / 100	0 ms	204 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>());
    int r = -1;
    for(int i=0;i<n;i++)
    {
        int k;
        cin >> k;
        if(k == 0) r = i;
        for(int j=0;j<k;j++)
        {
            int x;
            cin >> x; x--;
            adj[x].push_back(i);
        }
    }
    if(r == -1)
    {
        int mx = 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);
    // cout << "root : " << r << '\n';
    vector<int> g[n]; // directed tree
    vector<int> dist(n, -1), child(n);
    dist[r] = 0;
    while(!q.empty()){
        int u = q.front(); q.pop();
        for(auto v : adj[u]){
            if(dist[v] == -1)
            {
                g[u].push_back(v);
                // child[u]++;
                dist[v] = dist[u] + 1;
                q.push(v);
            }
        }   
    }
    // find shortest path for every leaf node to root
    // vector<int> d(n, 1);
    // for(int i=0;i<n;i++)
    // {
    //     if(!child[i])
    //     {
    //         queue<int> q2;
    //         vector<int> p(n, -1);
    //         q2.push(i);
    //         while(!q2.empty()){
    //             int x = q2.front(); q2.pop();
    //             if(x == r) break;
    //             for(auto i : g[x])
    //             {   
    //                 cout << x + 1 << " -> " << i + 1 << '\n';
    //                 if(p[i] == -1)
    //                 {
    //                     p[i] = x;
    //                     q2.push(i);
    //                 }
    //             }
    //         }
    //         vector<int> path;
    //         for(int v = r; v != -1; v = p[v])
    //         {
    //             path.push_back(v);
    //         }
    //         reverse(path.begin(), path.end());
    //         for(int i=1;i<path.size();i++)
    //         {
    //             d[i] += d[i - 1];
    //         }
    //     }
    // }
    vector<int> ans(n);
    function<int(int)> Dfs = [&](int v){
        int ret = 1;
        for(auto i : g[v])
        {
            ret += Dfs(i);
        }
        // cout << v << " : " << ret << '\n';
        return ans[v] = ret;
    };
    Dfs(r);
    int sm = 0;
    for(int i=0;i<n;i++)
    {
        // cout << ans[i] << " ";
        sm += ans[i];
    }
    cout << sm << '\n';

}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:30:30: 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]
   30 |             if(adj[i].size() > mx)
      |                ~~~~~~~~~~~~~~^~~~

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