Given a linked list and a value x, partition it such that all nodes less than x come before nod…

The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ... 1&nbs…

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you…

Given a binary tree, find the maximum path sum. The path may start and end at any node in the tree. For exampl…

Given a binary tree and a sum, find all root-to-leaf paths where each path’s sum equals the given sum. F…

主要考察的是代码的完整性：是否将所有情况考虑清楚，以及错误的输入情况。考察思考问题是否全面。 题目描述： 给定一个double类型的浮点数base和int类型的整数exponent。求base的exponent次方。 输…

Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] …

Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C wher…

Given n non-negative integers a1, a2, …, an, where each represents a point at c…

Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C&nb…

Say you have an array for which the ith element is the price of a given stock on day i. Design …

Given a sorted linked list, delete all duplicates such that each element appear only once. For example, G…