原创 LintCode | 408. 二進制求和
給定兩個二進制字符串，返回他們的和（用二進制表示）。 比較蠢的辦法 public class Solution { public String addBinary(String a, String b) {
2020-07-04 17:10:33
原创 LintCode | 66. 二叉樹的前序遍歷
給出一棵二叉樹，返回其節點值的前序遍歷。 題目鏈接 /** * Definition of TreeNode: * public class TreeNode { * public int val; *
2020-07-04 17:10:33
原创 LeetCode | 412. Fizz Buzz
Write a program that outputs the string representation of numbers from 1 to n. But for multiples of three it s
2020-07-04 17:10:30
原创 LintCode | 569. Add Digits
Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. 樣例 Given
2020-07-04 17:10:30
原创 LintCode | 167. 鏈表求和
你有兩個用鏈表代表的整數，其中每個節點包含一個數字。數字存儲按照在原來整數中相反的順序，使得第一個數字位於鏈表的開頭。寫出一個函數將兩個整數相加，用鏈表形式返回和。 /** * Definition for singly-l
2020-07-04 17:10:30
原创 LeetCode | 485. Max Consecutive Ones
Given a binary array, find the maximum number of consecutive 1s in this array. Example 1: Input: [1,1,0,1,1,1]
2020-07-04 17:10:28
原创 LeetCode | 492. Construct the Rectangle
For a web developer, it is very important to know how to design a web page’s size. So, given a specific rectangula
2020-07-04 17:10:26
原创 LeetCode | 463. Island Perimeter
You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid
2020-02-21 07:07:57
原创 LeetCode | 530. Minimum Absolute Difference in BST
Given a binary search tree with non-negative values, find the minimum absolute difference between values of any tw
2020-02-21 07:07:57
原创 LeetCode | 496. Next Greater Element I
You are given two arrays (without duplicates) nums1 and nums2 where nums1’s elements are subset of nums2. Find all
2020-02-21 07:07:57
原创 LintCode | 111. 爬樓梯
假設你正在爬樓梯，需要n步你才能到達頂部。但每次你只能爬一步或者兩步，你能有多少種不同的方法爬到樓頂部？ 題目鏈接 DP基礎題，不多說了。取模可以減少空間浪費。 public class Solution { /**
2020-02-21 07:07:57
原创 LeetCode | 506. Relative Ranks
Given scores of N athletes, find their relative ranks and the people with the top three highest scores, who will b
2020-02-21 07:07:57
原创 LeetCode | 520. Detect Capital
Given a word, you need to judge whether the usage of capitals in it is right or not. We define the usage of capita
2020-02-21 07:07:57
原创 LintCode | 69. 二叉樹的層次遍歷
給出一棵二叉樹，返回其節點值的層次遍歷（逐層從左往右訪問） /** * Definition of TreeNode: * public class TreeNode { * public int val;
2020-02-21 07:07:57
原创 LintCode | 376. 二叉樹的路徑和
給定一個二叉樹，找出所有路徑中各節點相加總和等於給定 目標值 的路徑。 一個有效的路徑，指的是從根節點到葉節點的路徑。 題目不難，關鍵在於想清楚遞歸怎麼判斷。 /** * Definition of TreeNode
2020-02-21 07:07:57