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A - XXXXX.cpp
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A - XXXXX.cpp
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#define ll long long
#include<bits/stdc++.h>
using namespace std;
int main()
{
ll T;
cin>>T;
while(T--)
{
ll n,x,i,ans;
cin>>n>>x;
ll arr[n],sum=0,count=0,c2=0;
for(i=0; i<n; i++)
{
cin>>arr[i];
sum+=arr[i];
if(arr[i]%x == 0)
count++;
}
if(sum%x!=0)
ans=n;
else if(count==n)
ans=-1;
else
{
ll left=0,right=0;
for(i=0; i<n; i++)
{
left++;
if(arr[i]%x!=0)
break;
}
for(i=n-1; i>=0; i--)
{
right++;
if(arr[i]%x!=0)
break;
}
ans=max(n-left,n-right);
}
cout<<ans<<endl;
}
return 0;
}