摘要： 题目如下： Given an array A of non-negative integers, the array is squareful if for every pair of adjacent elements, their sum is a perfect square. Return 阅读全文

摘要： 题目如下： We are stacking blocks to form a pyramid. Each block has a color which is a one letter string, like `'Z'`. For every block of color `C` we place 阅读全文