Submission #1166009

#	Time	Username	Problem	Language	Result	Execution time	Memory
1166009		sasde	Bosses (BOI16_bosses)	C++20	0 / 100	171 ms	327680 KiB

bosses

#include<bits/stdc++.h>
#define task "strdel"
#define int long long 
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii,ii>
#define se second
#define fi first
#define ffi fi.fi
#define sfi se.fi
#define sse se.se
#define fse fi.se
#define lt(i, c, d) for(int i = c; i <= d; ++i)
#define fl(i, c, d) for(int i = d; i >= c; --i)
#define pb push_back
#define emb emplace_back
#define emf emplace_front
#define em emplace
using namespace std;
const int N=5e3+5,lg=20,mod=1e9+7;
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int Rand(int u,int v){
 return u+rd()%(v-u+1);
}
int n,ans=1e18;
vector<int>a[N],a1[N];
int h[N],dist[N];
void dfs(int u){
    dist[u]=1;
    // cout<<u<<" ";
    for(int v:a1[u]){
        dfs(v);
        dist[u]+=dist[v];
    }
}
void bfs(int u){
    for(int i=1;i<=n;++i)h[i]=-1;
    h[u]=0;
queue<int>p;
p.em(u);
int sz=n;
while(!p.empty()){
    int x=p.front();
    p.pop();
    // cout <<x<<'\n';
    for(int v:a[x]){
        // cout <<v<<" ";
        if(h[v]==-1){
            h[v]=h[u]+1;
            p.em(v);
            a1[x].emb(v);--sz;
        }
    }
    // cout <<'\n';
}
// cout <<sz;
if(sz!=1)return;
dfs(u);

int res=0;
for(int i=1;i<=n;++i){
    res+=dist[i];
    a1[i].clear();
}
ans=min(ans,res);
}
void solve(){
    cin >> n ;
    for(int i=1;i<=n;++i){
        int k;
        cin >> k;
        for(int j=1;j<=k;++j){
            int u;
            cin >> u;
            a[u].emb(i);
        }
    }
    for(int i=1;i<=n;++i){
        bfs(i);
    }
    cout << ans;

}
main()
{
  srand(time(0));
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    if(fopen(task".inp","r")){
      freopen(task".inp","r",stdin);
      freopen(task".out","w",stdout);
    }
    int t=1;
 //   cin >> t;
while(t--){
    solve();
    cout<<'\n';
}

}

Compilation message (stderr)

bosses.cpp:84:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   84 | main()
      | ^~~~
bosses.cpp: In function 'int main()':
bosses.cpp:91:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |       freopen(task".inp","r",stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:92:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |       freopen(task".out","w",stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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