Abhishek Sharma

Question An integer x is a good if after rotating each digit individually by 180 degrees, we get a valid number that is different from x. Each digit must be rotated – we cannot choose to leave it alone. A number is valid if each…

Question Given a string s, you can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible strings we could create. Return the output in any order. Example 1: Input: s = “a1b2” Output: [“a1b2″,”a1B2″,”A1b2″,”A1B2”]…

Question You’re given strings jewels representing the types of stones that are jewels, and stones representing the stones you have. Each character in stones is a type of stone you have. You want to know how many of the stones you have are also jewels. Letters…

Question Given an m x n matrix, return true if the matrix is Toeplitz. Otherwise, return false. A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same elements. Example 1: Input: matrix = [[1,2,3,4],[5,1,2,3],[9,5,1,2]] Output: true Explanation: In the above grid, the diagonals are:…

Question You are given an integer array cost where cost[i] is the cost of ith step on a staircase. Once you pay the cost, you can either climb one or two steps. You can either start from the step with index 0, or the step with index 1.…

Question Given a characters array letters that is sorted in non-decreasing order and a character target, return the smallest character in the array that is larger than target. Note that the letters wrap around. For example, if target == ‘z’ and letters == [‘a’, ‘b’], the answer is ‘a’. Example 1: Input:…

Question Given an array of integers temperatures represents the daily temperatures, return an array answer such that answer[i] is the number of days you have to wait after the ith day to get a warmer temperature. If there is no future day for which this is possible, keep answer[i] ==…

Question 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, 128 % 2 == 0, and 128 % 8 == 0. A self-dividing number is not allowed to contain the digit zero. Given…

Question Given a string s, return the string after replacing every uppercase letter with the same lowercase letter. Example 1: Input: s = “Hello” Output: “hello” Example 2: Input: s = “here” Output: “here” Example 3: Input: s = “LOVELY” Output: “lovely”…

Question Given an array of integers nums which is sorted in ascending order, and an integer target, write a function to search target in nums. If target exists, then return its index. Otherwise, return -1. You must write an algorithm with O(log n) runtime complexity. Example 1: Input: nums = [-1,0,3,5,9,12],…