Submission #848286

#	Time	Username	Problem	Language	Result	Execution time	Memory
848286		Darren0724	Crazy old lady (IZhO13_crazy)	C++17	0 / 100	1 ms	348 KiB

crazy

#include <bits/stdc++.h>
using namespace std;
void solve(){
    int n;cin>>n;
    vector<int> v(n+1),pos(n+1);
    for(int i=1;i<=n;i++){
        cin>>v[i];
        pos[v[i]]=i;
    }
    vector<int> ans;
    for(int i=1;i<=n;i++){
        vector<int> a(n+1);
        a[i]=1;
        int flag=1;
        for(int j=1;j<=n;j++){
            if(j==v[i]){
                continue;
            }
            if(a[j]==0){
                a[j]=1;
                if(v[j]!=j){
                    flag=0;
                }
            }
            else if(a[pos[j]]==0){
                a[pos[j]]=1;
            }
            else{
                flag=0;
            }
        }
        if(flag){
            ans.push_back(i);
        }
    }
    cout<<(ans.size()==1?ans[0]:0)<<endl;
}
int32_t main() {
    int t;cin>>t;
    while(t--){
        solve();
    }
    
    return 0;
}

• Subtask 1: 0 / 100