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.
You are given an m x n grid and a ball placed at position [startRow, startColumn]. The ball can move to one of four adjacent cells or out of the grid boundary. You are allowed at most maxMove moves. Return the number of ways the ball can move out of the grid boundary modulo 10^9 + 7.
Given an integer array, find the shortest continuous subarray such that, if you sort this subarray in non-decreasing order, the whole array will become sorted.
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.
