原创 [leetCode] Find Minimum in Rotated Sorted Array I & II
Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7
原创 [leetCode] Compare Version Numbers
Compare two version numbers version1 and version1. If version1 > version2 return 1, if version1 < version2 return -1,
原创 [leetCode] Spiral Matrix II
Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example, Given n
原创 [leetCode] Word Search (new start. Let's go this)
Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequent
原创 [LeetCode] Sum Root to Leaf Numbers
Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is
原创 [leetCode] Maximum Product Subarray
Find the contiguous subarray within an array (containing at least one number) which has the largest product. For exam
原创 [leetCode] Subsets II
Given a collection of integers that might contain duplicates, nums, return all possible subsets. Note: Elements in a
原创 [leetCode] Maximum Gap
Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Try to solve
原创 [leetCode] Intersection of Two Linked Lists
Write a program to find the node at which the intersection of two singly linked lists begins. For example, the follow
原创 [leetCode] Subsets
Given a set of distinct integers, nums, return all possible subsets. Note: Elements in a subset must be in non-desce
原创 [LeetCode] Excel Sheet Column Title
Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: 1 -> A
原创 [leetCode] Merge Sorted Array
Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: You may assume tha
原创 [leetCode] Different Ways to Add Parentheses
Given a string of numbers and operators, return all possible results from computing all the different possible ways t
原创 [leetCode] Power of Two
Given an integer, write a function to determine if it is a power of two. public class Solution { public boolean isP
原创 [leetCode] House Robber
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed,