[LeetCode] Perfect Rectangle 完美矩形
Given N axis-aligned rectangles where N > 0, determine if they all together form an exact cove ...
原文：[LeetCode] Perfect Number 完美数字
We define the Perfect Number is apositiveinteger that is equal to the sum of all itspositivedivisors except itself. Now, given anintegern, write a function that returns true when it is a perfect numb ...
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