原创 Combination Sum II Java

 Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the ca

2020-06-16 11:37:37

原创 Unique Binary Search Trees Java

Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example, Given n =

2020-06-16 11:37:37

原创 Permutations Java

Given a collection of numbers, return all possible permutations. For example,[1,2,3] have the following permutations

2020-06-16 11:37:37

原创 Permutations II Java

 Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1

2020-06-16 11:37:37

原创 Plus One Java

Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored such

2020-06-16 11:37:36

原创 Android Interview question

Ref:http://androidjayavelu.blogspot.com/p/android-interview-question.html Android Interview question What is An

2020-06-16 11:37:36

原创 Restore IP Addresses Java

Given a string containing only digits, restore it by returning all possible valid IP address combinations. For exampl

2020-06-16 11:37:36

原创 Pascal's Triangle Java

Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5, Return [ [1],

2020-06-16 11:37:36

原创 Pascal's Triangle II

Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3, Return [1,3,3,1]. Note: Cou

2020-02-20 15:16:34

原创 Generate Parentheses Java

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example,

2020-02-20 15:16:33

原创 Length of Last Word Java

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last wo

2020-02-20 15:16:33 1

原创 Implement strStr() Java

Implement strStr(). Returns a pointer to the first occurrence of needle in haystack, or null if needle is not part of

2020-02-20 15:16:33

原创 Best Time to Buy and Sell Stock III Java

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

2020-02-20 15:16:33

原创 Reverse Words in a String Java

Given an input string, reverse the string word by word. For example, Given s = "the sky is blue", return "blue is sk

2020-02-20 15:16:33

原创 Unique Binary Search Trees II Java

Given n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example, Given n =

2020-02-20 15:16:33