Help me in solving ATBO problem

help
,
1

My issue

All of the test cases are correct except the last one. Could someone tell me what’s wrong in my code?

My code

for _ in range(int(input())):
    n = int(input().strip())
    a = list(map(int,input().strip().split()))
    b = list(map(int,input().strip().split()))
    flag = True
    for i in range(n-3):
        if a[i]==b[i]:
            continue
        elif b[i]==a[i]+a[i+1]+a[i+2]:
            n1,n2,n3,n4 = a[i],a[i+1],a[i+2],a[i+3]
            a[i]=n1+n2+n3
            a[i+1]=-n3
            a[i+2]=-n2
            a[i+3]=n2+n3+n4

        else:
            flag = False
            break

    if flag:
        if a!=b:
            print('NO')
        else:
            print('YES')
    else:
        print('NO')

Problem Link: Operating on A Practice Coding Problem - CodeChef