Sort Array by Increasing Frequency
Given an array nums of integers, you need to sort the array in increasing order based on the frequency of the values. If two values have the same frequency, sort…
Coding Patterns
Least Number of Unique Integers after K Removals
Given an array arr of integers and an integer k, you need to find the least number of unique integers after removing exactly k elements from the array.
Missing Number
You are given an array nums containing n distinct numbers taken from the range . The array has one missing number from this range. Find the missing number. Sample Input…
Set Mismatch
You have a set of integers nums that contains integers from 1 to n. However, there is one duplicate number and one missing number in the set. Return an array…
Find the Duplicate Number
Given an array nums containing n + 1 integers where each integer is in the range , prove that there is only one duplicate number in the array. Return this…
Find All Numbers Disappeared in an Array
Given an array nums of n integers where each integer is in the range , return an array of all the integers that do not appear in the array, sorted…
Find All Duplicates in an Array
Given an array nums of n integers where each integer is in the range , return an array of all the integers that appear more than once in the array,…
First Missing Positive
Given an unsorted integer array nums, find the smallest missing positive integer.
Kth Missing Positive Number
Given an array arr of positive integers sorted in ascending order, and an integer k, find the kth positive integer that is missing from the array.
Squares of a Sorted Array
Given an array of integers nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order.