原创 [leetcode]Two Pointers-344. Reverse String
Write a function that takes a string as input and returns the string reversed. Example: Given s = "hello", return "ol
2020-07-05 20:24:27
原创 [leetcode]Depth-first Search-695. Max Area of Island
Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-direction
2020-07-05 20:24:27
原创 [leetcode]Backtracking-39. Combination Sum
Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C
2018-09-04 13:54:15
原创 [leetcode]Tree-669. Trim a Binary Search Tree
Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements l
2018-09-04 13:54:14
原创 [leetcode] Hash Table-760. Find Anagram Mappings
Given two lists Aand B, and B is an anagram of A. B is an anagram of A means B is made by randomizing the order of
2018-09-04 13:54:14
原创 [leetcode]Array-697. Degree of an Array
Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency o
2018-09-04 13:54:14
原创 [leetcode]String-696. Count Binary Substrings
Give a string s, count the number of non-empty (contiguous) substrings that have the same number of 0's and 1's, and
2018-09-04 13:54:14
原创 [leetcode]Dynamic Programming-121. Best Time to Buy and Sell Stock
Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to
2018-09-04 13:54:13
原创 [leetcode]Math-413. Arithmetic Slices
A sequence of number is called arithmetic if it consists of at least three elements and if the difference between any
2018-09-04 13:54:13
原创 [leetcode]Binary Search-35. Search Insert Position
Given a sorted array and a target value, return the index if the target is found. If not, return the index where it wo
2018-09-04 13:54:13
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