Help me in solving ALIENOR problem

help
,
1

My issue

I do not know why my code is not working, Please help anyOne.

My code

for _ in range(int(input())):
    n, k = map(int, input().split())
    arr = []
    for _ in range(n):
        x = int(input(), 2)
        if x != 0 and x & (x - 1) == 0:
            arr.append(x)
    print("NO" if len(arr) < k else "YES")

Problem Link: ALIEN-OR Practice Coding Problem - CodeChef

2

There can be duplicates for x. You must consider this possibility and switch from list to set.