James Pan

原题网址：https://leetcode.com/problems/valid-anagram/ Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = "anagram", t = "nagaram", return true. s 

原题网址：https://leetcode.com/problems/word-pattern/ Given a pattern and a string str, find if str follows the same pattern. Here follow means a full match, such that there is a bijection betwee

原题网址：https://leetcode.com/problems/top-k-frequent-elements/ Given a non-empty array of integers, return the k most frequent elements. For example, Given [1,1,1,2,2,3] and k = 2, return [1,2].

原题网址：https://leetcode.com/problems/unique-word-abbreviation/ An abbreviation of a word follows the form . Below are some examples of word abbreviations: a) it --> it (no

原题网址：https://leetcode.com/problems/sparse-matrix-multiplication/ Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number.

原题网址：https://leetcode.com/problems/word-pattern-ii/ Given a pattern and a string str, find if str follows the same pattern. Here follow means a full match, such that there is a bijection bet

原题网址：https://leetcode.com/problems/design-tic-tac-toe/ Design a Tic-tac-toe game that is played between two players on a n x n grid. You may assume the following rules: A move is guaranteed