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Given a 2D matrix where every element is either ‘O’ or ‘X’, find the largest subsquare surrounded by ‘X’. Examples: Solution 1. O(N^4) runtime. Consid 阅读全文
摘要：
Given a 2D binary matrix filled with 0's and 1's, find the largest square containing all 1's and return its area. For example, given the following mat 阅读全文
摘要：
Given a number n, find the total number of numbers from 0 to 2^n - 1 which do not have consecutive 1s in their binary representation. Solution. This p 阅读全文
摘要：
Give a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from root node down to the nearest leaf n 阅读全文