[LeetCode] Number of Longest Increasing Subsequence 最长递增序列的个数
Given an unsorted array of integers, find the number of longest increasing subsequence. Example 1: Input: [1,3,5,4,7] Output: 2 Explanation: The two longest increasing subsequence are [1, 3, 4, 7] an....
[LeetCode] Binary Number with Alternating Bits 有交替位的二进制数
Given a positive integer, check whether it has alternating bits: namely, if two adjacent bits will always have different values. Example 1: Input: 5 Output: True Explanation: The binary representatio....
[LeetCode] Number of Distinct Islands 不同岛屿的个数
Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) You may assume all four edg...
[LeetCode] Palindrome Number 验证回文数字
Determine whether an integer is a palindrome. Do this without extra space. click to show spoilers. Some hints: Could negative integers be palindromes? (ie, -1) If you are thinking of converting the .....
[LeetCode] Single Number 单独的数字
Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without usi...
[LeetCode] Largest Number 最大组合数
Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330. Note: The result may b...
[LeetCode] Excel Sheet Column Number 求Excel表列序号
Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding column number. For example: A -> 1 B -> 2 C -> 3 ... ...
[LeetCode] Single Number II 单独的数字之二
Given an array of integers, every element appears three times except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it witho...
[LeetCode] Number of 1 Bits 位1的个数
Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit integer ’11' has binary representation 0...
[LeetCode] Number of Islands 岛屿的数量
Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You ...
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