Submission #355219

#	Time	Username	Problem	Language	Result	Execution time	Memory
355219		nicolaalexandra	Crazy old lady (IZhO13_crazy)	C++14	100 / 100	20 ms	512 KiB

crazy

#include <bits/stdc++.h>
#define DIM 1010
using namespace std;

int v[DIM],f[DIM];
int t,n,i;

int check (int poz){

    memset (f,0,sizeof f);


    f[v[1]] = 1;
    for (int i=2;i<=n;i++){

        if (i <= poz){

            if (!f[i-1] && v[i] != i-1)
                return 0;

            if (f[v[i]])
                return 0;
            f[v[i]] = 1;

        } else {
            if (!f[i] && v[i] != i)
                return 0;

            if (f[v[i]])
                return 0;
            f[v[i]] = 1;
        }

    }

    return 1;
}

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>t;
    for (;t--;){
        cin>>n;

        for (i=1;i<=n;i++)
            cin>>v[i];

        int sol = 0, cnt = 0;
        for (i=1;i<=n;i++){
            if (check(i)){
                sol = i;
                cnt++;
            }
        }

        if (cnt == 1)
            cout<<sol<<"\n";
        else cout<<"0\n";

    }



    return 0;
}

• Subtask 1: 100 / 100