Suppose we have an array nums with few duplicate elements and some unique elements. We have to find the sum of all the unique elements present in nums.So, if the input is like nums = [5, 2, 1, 5, 3, 1, 3, 8], then the output will be 10 because ... Read More

Suppose we have a ball factory where we have n balls numbered from l to r (both inclusive) and have an infinite number of boxes numbered from 1 to infinity. So if we put each ball in the box with a number same to the sum of digits of the ... Read More

Suppose we have a string s represents time in the form of hh:mm. Some of the digits in s are hidden (represented by ?). Considering 24hr clock, the valid times are between 00:00 and 23:59. We have to find the latest valid time that we can get from time by ... Read More

Suppose there is a biker who is going on a road trip. There are n different points in his road trip at different altitudes. The biker starts his trip from point 0 with altitude 0. If we have a sequence called gain with n elements, gain[i] is the net gain ... Read More

Suppose we have an array called rect where rect[i] has two elements [len_i, wid_i], where len_i and wid_i are representing the length and width of ith rectangle respectively. Now we can cut the ith rectangle to form a square whose side length is of k if both k Read More

Suppose we have a hidden array arr with n non-negative integers. Now this array is encoded into another array enc of length n-1. So here enc[i] = arr[i] XOR arr[i+1]. If we have the encoded enc array and an integer first, that is the first element of actual array, we ... Read More

Suppose you put 1Rs in a bank on first day say Monday. And every day from next day, Tuesday to Sunday, you put in 1Rs more than the day before. And on every subsequent Monday, you will put in 1Rs more than the previous Monday. If we have a number ... Read More

Suppose we have a set of boxes represented as a 2D array called boxTypes, where boxTypes[i] contains two elements [number of boxes of type i, number of units per box of type i]. Now we also have another value k, which is the maximum number of boxes that can be ... Read More

Suppose we have a string s whose length is even. We have to split this string into two different halves of same lengths. So consider 'a' is the first half and 'b' is the second half. We say two strings are alike when they have the same number of vowels ... Read More

Suppose we have a phone number as string. The phone number number consists of digits, spaces and/or dashes '-'. We want to reformat the phone number in a certain manner. There are few rules −Remove all spaces and dashes at beginningGroup the digits from left side to right side into ... Read More