水中的鱼

Given an integer, write a function to determine if it is a power of three. Follow up: Could you do it without using any loop / recursion...

Given a non-empty binary search tree and a target value, find the value in the BST that is closest to the target. Note: Given target va...

The set  [1,2,3,…, n ]  contains a total of  n ! unique permutations. By listing and labeling all of the permutations in order, We get ...

Given a string  s , partition  s  such that every substring of the partition is a palindrome. Return all possible palindrome partitionin...

In Binary Tree, Inorder successor of a node is the next node in Inorder traversal of the Binary Tree. Inorder Successor is NULL for the l...

Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example, [1,1,2]  have the fo...