数学·string模式

字符串相乘

Multiply Strings requires simulating integer multiplication using only string operations without direct numeric conversi…

二进制求和

Add Binary involves summing two binary strings and returning the result as a binary string using math and string manipul…

Excel 表列名称

Convert a positive integer to its corresponding Excel column title using base-26 math and string manipulation efficientl…

Excel 表列序号

This problem requires converting an Excel column title into its corresponding column number by applying a math and strin…

整数转换英文表示

Convert a given integer to its English words representation using mathematical logic and string manipulation.

数字转换为十六进制数

Convert a 32-bit integer to its hexadecimal string using math operations and careful string manipulation techniques.

Fizz Buzz

Generate a list from 1 to n replacing multiples of 3 with Fizz, 5 with Buzz, and both with FizzBuzz efficiently.

字符串相加

Given two non-negative integers as strings, sum them and return the result as a string without converting to integers di…

七进制数

Convert any given integer to its base 7 string representation using efficient math and string manipulation techniques.

复数乘法

This problem requires multiplying two complex numbers, given in string form, and returning the result in the same format…

寻找最近的回文数

Identify the nearest palindrome to a given integer string, handling ties and large numbers efficiently using math and st…

分数加减运算

Solve fraction addition and subtraction by handling expressions, calculating results, and simplifying fractions to irred…

求解方程

Solve the equation for the variable 'x' and determine its value or state if there is no solution or infinite solutions.

有序队列

Given a string and integer k, rearrange characters to achieve the lexicographically smallest string using limited rotati…

超级回文数

Count all super-palindromes in a given numeric range, where each is a palindrome and square of a palindrome.

相等的有理数

Given two rational numbers as strings with possible repeating decimals, determine if they represent the same number.

困于环中的机器人

Determine if a robot following a repeated instruction sequence stays within a bounded circle using math and string simul…

字符串的最大公因子

Find the greatest common divisor string between two strings based on the math and string patterns.

一年中的第几天

Calculate the day number of the year based on a given Gregorian calendar date in the format YYYY-MM-DD.

日期之间隔几天

Calculate the exact number of days between two dates using string parsing and arithmetic logic with consistent accuracy.

最简分数

Generate simplified fractions between 0 and 1 with denominators up to a given integer n.

仅含 1 的子串数

Calculate the number of contiguous substrings containing only 1s in a binary string using a math and string approach eff…

分割字符串的方案数

Count the number of ways to split a binary string into three non-empty parts with equal numbers of '1's.

统计同质子字符串的数目

This problem requires counting all homogenous substrings in a given string and returning the result modulo 10^9 + 7.