Submission #47573

#	Time	Username	Problem	Language	Result	Execution time	Memory
47573		dqhungdl	Crazy old lady (IZhO13_crazy)	C++17	100 / 100	14 ms	740 KiB

crazy

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

int T,n,a[1005];
bool Free[1005];

bool Check(int crazyid)
{
	for(int i=1;i<=n;i++)
		Free[i]=false;
	Free[a[1]]=true;
	int curid=1;
	for(int i=2;i<=n;i++)
	{
		if(curid==crazyid)
			curid++;
		if((Free[curid]==false&&a[i]!=curid)||Free[a[i]]==true)
			return false;
		Free[a[i]]=true;
		curid++;
	}
	return true;
}

int main()
{
	ios_base::sync_with_stdio(false);
	//freopen("TEST.INP","r",stdin);
	//freopen("TEST.OUT","w",stdout);
	cin>>T;
	while(T--)
	{
		cin>>n;
		for(int i=1;i<=n;i++)
			cin>>a[i];
		int id,res=0;
		for(int i=1;i<=n;i++)
			if(Check(i)==true)
			{
				res++;
				id=i;
			}
		cout<<(res==1?id:0)<<"\n";
	}
}

• Subtask 1: 100 / 100