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MAXSC
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#include <iostream>
using namespace std;
int main() {
long long int t,a[490000],sum,max,i,j,n,m,mi,secrow,min,f;
cin>>t;
while(t--)
{
cin>>n;
for(i=(n*n)-1;i>=0;i--)
{
cin>>a[i];
}
f=0;
m=n-1;
mi=0;
for(i=0;i<n;i++)
{
if(a[i]>mi)
{
mi=a[i];
}
}
j=0;
sum=mi;
max = mi;
j=n;
while(m--)
{ mi=0;
for(i=0;i<n;i++)
{
if(a[i+j]>mi && a[i+j]<max)
{
mi=a[i+j];
}
}
if(mi==0)
{
f=1;
break;
}
max=mi;
sum= sum + max;;
j=j+n;
}
if(f==1)
{
cout<<-1<<endl;
}
else
{
cout<<sum<<endl;
}
}
return 0;
}