Submission #695227

#	Time	Username	Problem	Language	Result	Execution time	Memory
695227		Abito	Bosses (BOI16_bosses)	C++14	100 / 100	720 ms	748 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define F first
#define S second
#define int long long
#define ep insert
const int N=5005;
int n,p[N],dp[N];
vector<int> adj[N];
vector<int> q;
void bfs(int node){
    q.pb(node);
    for (int i=0;i<q.size();i++){
        for (auto u:adj[q[i]]){
            if (p[u]) continue;
            p[u]=q[i];
            q.pb(u);
        }
    }return;
}
void getans(){
    reverse(q.begin(),q.end());
    for (int i=0;i<q.size()-1;i++) dp[p[q[i]]]+=dp[q[i]];
    return;
}
int32_t main(){
    cin>>n;
    for (int i=1;i<=n;i++){
        int x;cin>>x;
        while (x--){
            int y;cin>>y;
            adj[y].pb(i);
        }
    }
    int ans=INT_MAX;
    for (int i=1;i<=n;i++){
        q.clear();
        for (int i=1;i<=n;i++){
            p[i]=0;
            dp[i]=1;
        }p[i]=-1;
        bfs(i);
        if (q.size()<n) continue;
        getans();
        int s=0;
        for (int i=1;i<=n;i++) s+=dp[i];
        ans=min(ans,s);
    }cout<<ans<<endl;
    return 0;
}

Compilation message (stderr)

bosses.cpp: In function 'void bfs(long long int)':
bosses.cpp:14:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for (int i=0;i<q.size();i++){
      |                  ~^~~~~~~~~
bosses.cpp: In function 'void getans()':
bosses.cpp:24:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for (int i=0;i<q.size()-1;i++) dp[p[q[i]]]+=dp[q[i]];
      |                  ~^~~~~~~~~~~
bosses.cpp: In function 'int32_t main()':
bosses.cpp:44:21: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   44 |         if (q.size()<n) continue;
      |             ~~~~~~~~^~

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