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(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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