Given two strings s1 and s2, return true if s2 contains any permutation of s1 as a substring, otherwise return false. In other words, check if one of the permutations of s1 exists as a substring within s2.
Given two strings word1 and word2, return the minimum number of steps required to make word1 and word2 the same. In one step, you can delete exactly one character in either string.
Given a string expression representing a mathematical expression with fractions involving addition and subtraction, compute the result of the expression. The result should be simplified and returned in the form of a fraction. If the result is an integer, represent it as a fraction with denominator 1.
Given an equation with a variable ‘x’ and basic arithmetic operations (’+’, ‘-’), find the value of ‘x’. The equation might have a solution, no solution, or infinite solutions. Your task is to return the correct result in the form of a string.
