Given an integer array hours representing times in hours, return an integer denoting the number of pairs i, j where i < j and hours[i] + hours[j] forms a complete day.
A complete day is defined as a time duration that is an exact multiple of 24 hours.
\n\nFor example, 1 day is 24 hours, 2 days is 48 hours, 3 days is 72 hours, and so on.
\n\n\n
Example 1:
\n\nInput: hours = [12,12,30,24,24]
\n\nOutput: 2
\n\nExplanation: The pairs of indices that form a complete day are (0, 1) and (3, 4).
Example 2:
\n\nInput: hours = [72,48,24,3]
\n\nOutput: 3
\n\nExplanation: The pairs of indices that form a complete day are (0, 1), (0, 2), and (1, 2).
\n
Constraints:
\n\n1 <= hours.length <= 5 * 1051 <= hours[i] <= 109给你一个整数数组 hours，表示以 小时 为单位的时间，返回一个整数，表示满足 i < j 且 hours[i] + hours[j] 构成 整天 的下标对 i, j 的数目。
整天 定义为时间持续时间是 24 小时的 整数倍 。
\n\n例如，1 天是 24 小时，2 天是 48 小时，3 天是 72 小时，以此类推。
\n\n\n\n
示例 1：
\n\n输入： hours = [12,12,30,24,24]
\n\n输出： 2
\n\n解释：
\n\n构成整天的下标对分别是 (0, 1) 和 (3, 4)。
示例 2：
\n\n输入： hours = [72,48,24,3]
\n\n输出： 3
\n\n解释：
\n\n构成整天的下标对分别是 (0, 1)、(0, 2) 和 (1, 2)。
\n\n
提示：
\n\n1 <= hours.length <= 5 * 1051 <= hours[i] <= 109(i, j) forms a valid complete day if (hours[i] + hours[j]) % 24 == 0.",
"Using an array or a map, for each index j moving from left to right, increase the answer by the count of (24 - hours[j]) % 24, and then increase the count of hours[j]."
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