摘要：
Given an array with n integers, you need to find if there are triplets (i, j, k) which satisfies following conditions: where we define that subarray ( 阅读全文
摘要：
Given a picture consisting of black and white pixels, and a positive integer N, find the number of black pixels located at some specific row R and col 阅读全文
摘要：
Given a picture consisting of black and white pixels, find the number of black lonely pixels. The picture is represented by a 2D char array consisting 阅读全文
摘要：
Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced to get t. All occurrenc 阅读全文