Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For the purpose of this problem, we define empty string as valid …
Question: Given an array and a element, remove all instances of that value in place and return the new length. The order of elements can be changed and it …
Question : Given a sorted list represented by a directional link structure (as follows), remove the duplicates and return the new list. /** * Definition for singly-linked list. * …
Given two binary trees (defined structure in C++ as follows), check if they are identical (same tree structure and the values to the nodes are also the same): /** …
Question: You are climbing stairs. It takes n steps to get to the top. Each time, you can take 1 step or 2 steps. How many distinct ways to get to …
Question: Given an unsorted list of integers, find out the first missing positive. Problem Description: http://oj.leetcode.com/problems/first-missing-positive/ Examples: should return 3; should return 2. Can you do it with O(n) …
