IncredibleThings

摘要： Given an array of integers nums. A pair (i,j) is called good if nums[i] == nums[j] and i < j. Return the number of good pairs. Example 1: Input: nums 阅读全文

摘要： You're given strings jewels representing the types of stones that are jewels, and stones representing the stones you have. Each character in stones is 阅读全文

摘要： Given an integer n, return all the structurally unique BST's (binary search trees), which has exactly n nodes of unique values from 1 to n. Return the 阅读全文