Submission #1213269

#	Time	Username	Problem	Language	Result	Execution time	Memory
1213269		minhpk	Bosses (BOI16_bosses)	C++20	100 / 100	637 ms	24416 KiB

bosses

#include <bits/stdc++.h>
#define int long long
using namespace std;
int a;
vector<int> z[1000005];
int depth[1000005];
int min1=1e18;
int pre[1000005];
void bfs(int sta){
    for (int i=1;i<=a;i++){
         depth[i]=0;
         pre[i]=1;
    }
    queue<int> q;
    q.push(sta);
    depth[sta]=1;
    vector <pair<int,int>> v;
    while (q.size()){
         int pos=q.front();
         q.pop();
         for (auto p:z[pos]){
              if (!depth[p]){
                 depth[p]=depth[pos]+1;
                 q.push(p);
                 v.push_back({p,pos});
              }
         }
    }
    int sum=0;
    for (int i=1;i<=a;i++){
         if (!depth[i]){
            return;
         }
    }
    while (v.size()){
           auto [x,y]=v.back();
           v.pop_back();
           sum+=pre[x];
           pre[y]+=pre[x];
    }
    sum+=pre[sta];
   // cout << sta << " " << sum << "\n";
    min1=min(min1,sum);
}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> a;
    for (int i=1;i<=a;i++){
         int c;
         cin >> c;
         for (int j=1;j<=c;j++){
             int x;
             cin >> x;
             z[x].push_back(i);
         }
    }
    for (int i=1;i<=a;i++){
         bfs(i);
    }
    cout << min1 << "\n";
    return 0;
}

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