原创 189. Rotate Array
Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] i
2020-02-26 00:36:45
原创 274,275. H-Index I, II
Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to compute the
2018-09-04 13:02:45
原创 221. Maximal Square
Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area. Fo
2018-09-04 13:02:42
1
原创 211. Add and Search Word - Data structure design
Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word
2018-09-04 13:02:41
原创 10. Regular Expression Matching
Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches
2018-09-04 13:02:41
原创 208. Implement Trie (Prefix Tree)
Implement a trie with insert, search, and startsWith methods. Note: You may assume that all inputs are consist of l
2018-09-04 13:02:41
3
原创 301. Remove Invalid Parentheses
題目： Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible res
2018-09-04 13:02:40
2
原创 325. Maximum Size Subarray Sum Equals k
題目 Given an array nums and a target value k, find the maximum length of a subarray that sums to k. If there isn't one,
2018-09-04 13:02:40
原创 164. Maximum Gap
Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Try to solve
2018-09-04 13:02:40
2
原创 374,375. Guess Number Higher or Lower I,II
We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number
2018-09-04 13:02:40
1
原创 30. Substring with Concatenation of All Words
You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of
2018-09-04 13:02:39
原创 146. LRU Cache
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations:
2018-09-04 13:02:38
原创 91. Decode Ways
A message containing letters from A-Z is being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ...
2018-09-04 13:02:38
原创 257. Binary Tree Paths
Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2
2018-09-04 13:02:38
原创 Heap & Priority Queue
Heap: Array & Linked List & abstract implementation: http://cs.bluecc.edu/java/CS260/Notes/Priority.htm PriorityQueu
2018-09-04 13:02:38