#include<bits/stdc++.h>
using namespace std;
signed main(){
    int t;
    cin>>t;
    while(t--){
        int n;
        cin>>n;
        vector<int>arr;
        for(int i=0;i<n;i++){
            int x;
            cin>>x;
            arr.push_back(x);
        }
        int s=0,e=arr.size()-1;
        int x=arr[s];
        int y=arr[e];
        int result=0;
        while(s+1<e){
            if(x==y){
                result=max(result,(s+1)+(n-e));
                s++;
                x+=arr[s];
            }
            else if(x<y){
                s++;
                x+=arr[s];
            }
            else{
                e--;
                y+=arr[e];
            }
        }
        if(x==y){
            result=max(result,(s+1)+(n-e));
        }
        cout<<result<<endl;
    }
    return 0;
}

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

NAozCjEwIDIwIDEwCjYKMiAxIDQgMiA0IDEKNQoxIDIgNCA4IDE2CjkKNyAzIDIwIDUgMTUgMSAxMSA4IDEwCg==

4
3
10 20 10
6
2 1 4 2 4 1
5
1 2 4 8 16
9
7 3 20 5 15 1 11 8 10