Problem in staircase search code

#1

#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,i,j,key;
int a[1000][1000];
cin>>n;
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
cin>>a[i][j];
}
cout<<endl;
}
cin>>key;
i=0;
j=n-1;
if(key==a[0][0])
{
cout<<“found at index 0,0”<<endl;
}
else if(key==a[n-1][n-1])
{
cout<<“found at index “<<n-1<<”,”<<n-1<<endl;
}
while(i<=j)
{
if(key>a[i][j])
{
i++;
}
else if(key<a[i][j])
{
j–;
}
else
{
cout<<“found at index “<<i<<”,”<<j;
break;
}
}
}
this code is not showing answer for some of the elements,plese check it and correct it

#2

please share code in cb ide

#3

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