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Question Given an integer N, find the greatest integer less than N and has the same digits. If there is no such integer, return -1. For example: Input = 630 Output = 603 Input = 603 Output = 360 Input = 360 Output = 306 Input = 306 Output = -1 (Be careful, 063 could […]

Question Imagine an array that contains both integers and nested arrays, such as the following: [[2, [9, 1, 3], 8], 1, 4]. The depth sum is described as the weighted sum of each integer, weighted by their respective depths. In the example, 9’s depth is 3, while 8’s depth is 2, and 4’s depth is […]

Given a matrix in the form (int height, int weight, vector < vector < int > > matrix), determine if the matrix is in the form of Toeplitz. In linear algebra, a Toeplitz matrix or diagonal-constant matrix, named after Otto Toeplitz, is a matrix in which each descending diagonal from left to right is constant. […]

Find the minimum depth (depth of first leaf) of a binary tree.