Given a first element a and common difference d of an arithmetic progression. Write a program to find the nth term in that progression. Example: a = 1, d = 2, n = 5 output: 9 a = 2, d = 5, n = 4 output: 17 Solution: Formula for finding nth term in an … Read more
You are on a business trip and traveling from one city to another. you have a stack of unsorted flight boarding passes. The only departure city and destination city are on the boarding pass. how do you find the first departure city and your final destination city, Example: [Dallas, Austin], [Houston, Dallas], [Austin, Seattle] Output: … Read more
Given an array of numbers, write a program to rank the array elements. Example: Given array: [22, 11, 44, 66, 55] Rank: [2, 1, 3, 5, 4] Given array: [15, 12, 11, 10, 9] Rank: [5, 4, 3, 2, 1] Given array: [10, 20, 30, 40, 50] Rank: [1, 2, 3, 4, 5] Given array: … Read more
GIven an array of numbers, find out if array contains three consecutive odd numbers Example: [2, 4, 1, 3, 4, 1, 3, 6] Three consecutive odds: false [2, 4, 1, 3, 4, 1, 3, 6] Three consecutive odds: true [2, 4, 1, 3, 4, 1, 3, 6] Three consecutive odds: true Solution: Initialize count = … Read more
Given an array of numbers, you need to find out whether an array can be converted to a non-decreasing array where you are allowed to modify the maximum one element in the array. Non-decreasing array: Array is called non-decreasing array when you traverse array from left to right, each element on the left is less … Read more
Given an array of numbers, you need to duplicate the zero’s in the array. Do not extend the size of array, just discard the remaining elements (had array gets extended, those elements) after the array size. Example: Input: [1, 0, 2, 3, 0, 4, 5, 0] Output: [1, 0, 0, 2, 3, 0, 0, 4] … Read more
Given a decimal number, convert that number to its binary representation. Example: Number: 5, binary representation: 101 Number: 8, binary representation: 1000 Number: 105, binary representation: 1101001 Solution: Initialize a result string and while the given number is greater than 0, keep dividing it by 2 and append the remainder of division to the result … Read more
Given a binary array (contains only 0’s and 1’s), find out the number of maximum consecutive ones. Example: Input: [0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1] Max consecutive ones: 4 Input: [0, 1, 1, 0, 1, 1], Max consecutive ones: 2 Input: [0, 0, 0, 0] Max consecutive ones: 0 Solution: … Read more
Given an array of numbers, write a program to duplicate the even numbers and return the new array. Example: Input: [2, 4, 1, 5, 2, 3, 8, 9, 10, 4] Output: [2, 2, 4, 4, 1, 5, 2, 2, 3, 8, 8, 9, 10, 10, 4, 4] Input: [2, 4, 6, 8] Output: [2, 2, … Read more
Write a program to add the digits of the given number until the number becomes a single digit number. Example: Input: 256, Output: 4 256 -> 13 -> 4 Input: 15, Output: 6 15 -> 6 Input: 82, Output: 1 82 -> 10 -> 1 Input: 242239, Output: 4 242239 -> 22 -> 4 Approach: … Read more
Given an array of integers, write a program to find the number of pairs for which the XOR is an odd number. Example: Input[] = {3, 2, 1} Output: 2 Note: 1 XOR 2 = 3 and 2 XOR 3 = 1 Input[] = {3, 6, 9, 4} Output: 4 Naive Approach: Use nested loops … Read more
Write a program to add the digits of the given number until the number becomes a single digit number. Example: Input: 256, Output: 4 256 -> 13 -> 4 Input: 15, Output: 6 15 -> 6 Input: 82, Output: 1 82 -> 10 -> 1 Input: 242239, Output: 4 242239 -> 22 -> 4 Approach: … Read more
In school a student gets rewarded if he has an attendance record without being absent for more than once or being late for 3 times continuously. Given a student’s attendance record represented by a string. The record only contains the following three characters: ‘A’ : Absent. ‘L’ : Late. ‘O’ : On-Time. Check whether the … Read more
Given a sorted array of integers, write a program to remove duplicates in-place by modifying the given array such that all unique integers will be at the beginning of the array, and do not worry about other indexes after the new length. Example: Given Input: [1, 1, 2, 3, 3] Output: [1, 2, 3, 3, … Read more
Given a string, write a function that returns a random character from the string. Example: Given string = algorithms @ tutorial horizon Random character: s Random character: r Random character: h Random character: @ Random character: i Approach: Get the length of the string and then use the java random function to get the random … Read more