原创 Best Time to Buy and Sell Stock I, II
Best Time to Buy and Sell Stock I Say you have an array for which the ith element is the price of a given stock
2020-07-03 03:22:25
原创 Linked List Cycle I II
Linked List Cycle Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without u
2020-07-03 03:22:14
原创 Reverse Words
Reverse Words Write a function that reverses the order of the words in a string. For example, your function should tran
2020-07-03 03:22:14
原创 Course Schedule
Course Schedule There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may hav
2020-02-25 03:41:18
原创 implement a queue using stack
//implement a queue using stack public class Solution { Stack<Integer> stack1 = new Stack<Integer>(); Stack<I
2020-02-25 03:41:18
原创 Basic Calculator
Basic Calculator Implement a basic calculator to evaluate a simple expression string. The expression string may
2020-02-25 03:41:18
原创 Course Schedule II
Course Schedule II There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may
2020-02-25 03:41:18
原创 Remove Duplicates from Sorted Array I, II
Remove Duplicates from Sorted Array II Follow up for "Remove Duplicates": What if duplicates are allowed at most
2020-02-25 03:41:18
原创 Ternary Expression
Ternary Expression a?b:c a / \ b c a?b?c:d:e a / \ b e / \ c d a?b:c?d:e a / \ b c / \
2020-02-25 03:41:18
原创 Word Search
Word Search Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from lette
2020-02-25 03:41:18
原创 Triangle
Triangle Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numb
2020-02-25 03:41:18
原创 House Robber
House Robber You are a professional robber planning to rob houses along a street. Each house has a certain amou
2020-02-25 03:41:18
原创 Serialize and Deserialize a binary tree
Serialize and Deserialize a binary tree void Serialize(TreeNode node) { if (node == null) { System.out.print(
2020-02-25 03:41:18
原创 N-Queens II
N-Queens II Follow up for N-Queens problem. Now, instead outputting board configurations, return the total numb
2020-02-25 03:41:18
原创 House Robber II
House Robber II Note: This is an extension of House Robber. After robbing those houses on that street, the thie
2020-02-25 03:41:18