2025-08-24 10:33:19 +0000 UTC

class Solution:
    def isBalanced(self, num: str) -> bool:
        sm, n = 0, len(num)
        for i in range(n):
            if i % 2 == 0:
                sm += int(num[i])
            else:
                sm -= int(num[i])
        return sm == 0