Code is not running

My code is right but it is not passing any test cases ,it shows right answer for sample input

@mayurjhode55 send your code

#include
#include<bits/stdc++.h>
using namespace std;
int main() {
long long int n,sum=0,rum=0;
cin>>n;
while(n–){
long long int t;
cin>>t;
int a[t];
for(int i=0;i<t;i++){
cin>>a[i];
}
sum=0;
for(int i=0;i<t;i++){
sum=sum+a[i];
if(sum<0){
sum=0;
}
rum=max(sum,rum);
}
cout<<rum<<’\n’;
}
return 0;
}

@mayurjhode55 inside while loop put rum=0

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