#include <iostream>
using namespace std;
int main() {
int t;
cin>>t;
while(t--){
int n;
cin>>n;
int a[n];
for(int i=0;i<n;i++){
cin>>a[i];
}
for(int i=n-1;i>=0;i--){
if(a[i-1]>a[i]){
a[i-1]=a[i];
}
}
long long int sum=0;
for(int i=0;i<n;i++){
sum+=a[i];
}
cout<<sum<<"\n";
}
return 0;
}
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