随笔分类 - Math
摘要：［抄题］： A self-dividing number is a number that is divisible by every digit it contains. For example, 128 is a self-dividing number because 128 % 1 == 0
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摘要：［抄题］： Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: Example 1: Example 2: Example 3: [暴力解法
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摘要：［抄题］： Given a column title as appear in an Excel sheet, return its corresponding column number. For example: Example 1: Example 2: Example 3: [暴力解法]：
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摘要：［抄题］： Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. For example: Given num = 38, the process is
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摘要：［抄题］： 将一个整数中的数字进行颠倒，当颠倒后的整数溢出时，返回 0 (标记为 32 位整数)。 将一个整数中的数字进行颠倒，当颠倒后的整数溢出时，返回 0 (标记为 32 位整数)。 将一个整数中的数字进行颠倒，当颠倒后的整数溢出时，返回 0 (标记为 32 位整数)。 样例 给定 x = 12
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摘要：［抄题］： Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Example 2: Examp
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摘要：［抄题］： Winter is coming! Your first job during the contest is to design a standard heater with fixed warm radius to warm all the houses. Now, you are g
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摘要：［抄题］： Count the number of prime numbers less than a non-negative number, n. [暴力解法]： 时间分析： 空间分析： [优化后]： 时间分析： 空间分析： ［奇葩输出条件］： ［奇葩corner case］： ［思维问题］：
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摘要：［抄题］： You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizonta
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摘要：［抄题］： You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note:You have to rotate the image in-place,
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