学海无涯

摘要： Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. 阅读全文

摘要： 随手搜的一个问题，本来只是想印证一下自己的想法，怎料这个问题居然还有这么多不同的说法。 阅读全文

摘要： Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n). 阅读全文

摘要： Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue. 阅读全文

摘要： Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: * Integers in each row are sorted from left to right. * The first integer of each row is greater than the last integer of the previous row. 阅读全文

摘要： Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 阅读全文

摘要： Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) 阅读全文

摘要： Given an absolute path for a file (Unix-style), simplify it. 阅读全文

摘要： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top? Note: Given n will be a positive integer. 阅读全文

摘要： Implement int sqrt(int x). Compute and return the square root of x. 阅读全文