写代码的时候遇到模的问题

class Solution:
    def countCompleteDayPairs(self, hours: List[int]) -> int:
        ans = 0
        t = [0 for _ in range(24)]
        for h in hours:
            u = (24-h%24)%24
            ans += t[u]
            t[h%24] += 1
        return ans

如果写成 u = (24-h%24) 是不对的，没有考虑h等于0的情况