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文章 2021-03-30 来自：开发者社区

[leetcode/lintcode 题解] 阿里算法面试真题：丑数 II · Ugly Number II

描述设计一个算法，找出只含素因子2，3，5 的第 n 小的数。符合条件的数如：1, 2, 3, 4, 5, 6, 8, 9, 10, 12...：我们可以认为 1 也是一个丑数。在线评测地址：领扣题库官网样例1 输入：9 输出：10样例2 输入：1 输出：1解题思路1：最小堆很容易想到的方法是：从1起检验每个数是否为丑数，直到找到n个丑数为止。但是随着n的增大，绝大部分数字都不是丑数，我们枚举的....

[leetcode/lintcode 题解] 阿里算法面试真题：丑数 II · Ugly Number II
文章 2018-12-16 来自：开发者社区

[LintCode] Number of Islands（岛屿个数）

描述 给一个01矩阵，求不同的岛屿的个数。 0代表海，1代表岛，如果两个1相邻，那么这两个1属于同一个岛。我们只考虑上下左右为相邻。 样例 在矩阵： [ [1, 1, 0, 0, 0], [0, 1, 0, 0, 1], [0, 0, 0, 1, 1], [0, 0, 0, 0, 0], [0, 0, 0, 0, 1] ] 中有 3 个岛。   代码 GitHu...

文章 2017-12-14 来自：开发者社区

[LintCode] Super Ugly Number 超级丑陋数

Write a program to find the nth super ugly number. Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes of size k. For example, [1, 2, 4, 7, 8, 13, 14, 1....

文章 2017-12-14 来自：开发者社区

[LintCode] Ugly Number 丑陋数

Write a program to check whether a given number is an ugly number`. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since i....

文章 2017-12-13 来自：开发者社区

[LintCode] Happy Number 快乐数

Write an algorithm to determine if a number is happy. A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of ....

文章 2017-12-13 来自：开发者社区

[LintCode] Create Maximum Number 创建最大数

Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k <= m + n from digits of the two. The relative order of the digits from the same a....

文章 2017-12-13 来自：开发者社区

[LintCode] Number of Islands 岛屿的数量

Given a boolean 2D matrix, find the number of islands.  Notice 0 is represented as the sea, 1 is represented as the island. If two 1 is adjacent, we consider them in the same island. We only cons...

文章 2017-12-13 来自：开发者社区

[LintCode] Letter Combinations of a Phone Number 电话号码的字母组合

Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. Notice Although the...

文章 2017-12-12 来自：开发者社区

[LintCode] Valid Number 验证数字

Validate if a given string is numeric. Have you met this question in a real interview?&nbsp; Yes Example "0"&nbsp;=&gt;&nbsp;true " 0.1 "&nbsp;=&gt;&nbsp;true "abc"&nbsp;=&gt;&nbsp;false "1 a"&nbsp;=&...

文章 2017-12-12 来自：开发者社区

[LintCode] Kth Smallest Number in Sorted Matrix 有序矩阵中第K小的数字

Find the kth smallest number in at row and column sorted matrix. Have you met this question in a real interview?  Yes Example Given k = 4 and a matrix: [ [1 ,5 ,7], [3 ,7 ,8], [4 ,...

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