原创 Balanced Binary Tree
Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined a
2020-02-24 10:27:45
原创 Best Time to Buy and Sell Stock II
ay you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find th
2020-02-24 10:27:45
原创 Populating Next Right Pointers in Each Node II
Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tr
2020-02-24 10:27:45
原创 String to Integer (atoi)
Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a ch
2020-02-24 10:27:45
原创 Linked List Cycle II
Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Follow up: Can you so
2020-02-24 10:27:45
原创 Copy List with Random Pointer
A linked list is given such that each node contains an additional random pointer which could point to any node in the
2020-02-24 10:27:45
原创 Minimum Depth of Binary Tree
Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from th
2020-02-24 10:27:45
原创 Pow(x, n)
Implement pow(x, n). class Solution { public: double pow(double x, int n) { if(x==0) return 0; if(n
2020-02-24 10:27:45
原创 3Sum
Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets
2020-02-24 10:27:45
原创 Clone Graph
Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors. OJ's undirected grap
2020-02-24 10:27:45
原创 Validate Binary Search Tree
Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The lef
2020-02-24 10:27:45
原创 Text Justification
Given an array of words and a length L, format the text such that each line has exactly L characters and is fully (lef
2020-02-24 10:27:45
原创 Permutations
Given a collection of numbers, return all possible permutations. For example,[1,2,3] have the following permutations:
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原创 Valid Palindrome
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For exa
2020-02-24 10:27:45
原创 3Sum Closest
Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Retur
2020-02-24 10:27:45