__Meng

摘要： Given an array of integers nums sorted in ascending order, find the starting and ending position of a given target value. Your algorithm's runtime com 阅读全文

摘要： Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element 阅读全文

摘要： Given a string s and a string t, check if s is subsequence of t. You may assume that there is only lower case English letters in both s and t. t is po 阅读全文

摘要： There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of the hor 阅读全文

摘要： Given a collection of intervals, find the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping. Note: Exam 阅读全文

摘要： Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Example 2: Example 3: 阅读全文

摘要： Implement a trie with insert, search, and startsWith methods. Example: Note: You may assume that all inputs are consist of lowercase letters a-z. All 阅读全文

摘要： Given a non-empty array containing only positive integers, find if the array can be partitioned into two subsets such that the sum of elements in both 阅读全文

摘要： Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacen 阅读全文

摘要： Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. Example 1: Example 2: 阅读全文