Codechef 18 :
for _ in range(int(input())):
n=int(input())
arr1=[int(i) for i in input().split()]
arr2=[int(i) for i in input().split()]
sum1=0
sum2=0
side=0
https://www.codechef.com/LTIME84B/problems/WWALK
for i in range(n):
if sum1==sum2:
if arr1[i] == arr2[i]:
side+=arr1[i]
sum1+=arr1[i]
sum2+=arr2[i]
print(side)
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