//
#include<bits/stdc++.h>
using namespace std;
const int N=2222;
int in[N];
int main()
{
int t,n,i,x;
cin>>t;
while( t-- )
{
cin>>n;
for( i=0;i<n;i++ )
{
cin>>x; in[i]=x%2;
}
for( i=1;i<n;i++ )
{
if( in[i-1]+in[i]!=1 ) break;
}
if( i==n ) cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
return 0;
}
//
#include<bits/stdc++.h>
using namespace std;
int main()
{
int t,n,x,f,i;
cin>>t;
while( t-- )
{
cin>>n; cin>>x; f=x%2;
for( i=1;i<n;i++ )
{
cin>>x; f=( f+1 )%2;
if( x%2 != f ) break; // 样例没读全!!!
}
if( i==n ) cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
return 0;
}