Arrays

274+ posts

Last Updated: 21 September 2026

Given an array arr[] and an integer k, return all elements of arr that are less than k. The elements in the returned vector should appear in the same order as in the origi...read more

DSA

Arrays

Reverse Order of Rows of a Matrix

Last Updated: 19 September 2026

Given a matrix mat[][] of size n × m, reverse the order of its rows in-place. After the operation, the first row should become the last row, the second row should become ...read more

DSA

Arrays

R-Matrix

Swap All with Next of Next

Last Updated: 19 September 2026

Given an array arr[], swap every ith element of the array with (i+2)th element.Examples:Input: arr[] = [1, 2, 3, 4, 5]Output: [3, 4, 5, 2, 1]Explanation: Swapping 1 and 3,...read more

DSA

Arrays

Sum of Submatrix Elements

Last Updated: 21 September 2026

Given a matrix arr[][] of size n * m and four integers x1, y1, x2, and y2 representing the top-left and bottom-right corners of a submatrix (using 1-based indexing), find ...read more

DSA

Arrays

R-Matrix

Count Occurrences of Each Day of Week

Last Updated: 17 September 2026

Given an integer n representing the number of days beginning from 1st date of a month and an integer k representing the starting day of the month, where 1 denotes Monday, ...read more

DSA

Modular Arithmetic

Arrays

Count n/k Times Occurring

Last Updated: 17 September 2026

Given an array arr[] (may contain duplicates) and a positive integer k, count the number of elements whose occurrence is exactly equal to the size of array arr[] divided b...read more

DSA

Arrays

Minimum Possible Maximum Value in Array After Subtractions

Last Updated: 16 September 2026

Given an array arr[] of n positive integers, you can perform the following operation any number of times:Choose two indices i and j such that arr[i] = arr[j].Replace arr[i...read more

DSA

Arrays

number-theory

Swap Adjacent in Array

Last Updated: 12 September 2026

Given an array arr[] of positive integers, swap the ith element with the (i + 2)th element for every valid i, starting from i = 0 and moving from left to right. Return the...read more

DSA

Arrays

Most Frequent of Two

Last Updated: 10 September 2026

Given an array arr[] and two elements x and y, return the element that occurs more frequently. If both elements have the same frequency, return the smaller one.Examples:In...read more

DSA

Arrays

Multiply Left and Right Array Sums

Last Updated: 08 September 2026

Given an array of integers arr[], divide it into two subarrays left and right such that left contains the first half of the elements and right contains the remaining eleme...read more

DSA

Arrays

Number of Matches

Last Updated: 06 September 2026

There are n players participating in a knockout tournament. The rating of the i-th player is given by arr[i], where all ratings are distinct.The tournament is conducted in...read more

DSA

Arrays

Energy After Crossing All Hurdles

Last Updated: 13 September 2026

Given two arrays e[] and h[] of equal size n, representing the energy gained before each hurdle and the height of each hurdle, respectively. Starting with 0 carried energy...read more

DSA

Arrays

Distribution with i allocated to arr[i]

Last Updated: 05 August 2026

Given an integer array arr[] of n elements, where arr[i] represents the number of goodies currently held by the (i+1)th student. The goodies can be redistributed among the...read more

DSA

Arrays

C++ Mathematical Programs

DSA

Max Gold Coins from Limited Plates

Last Updated: 07 July 2026

Given n gold boxes, where the i-th box contains a[i] plates and each plate in that box contains b[i] gold coins. A thief can carry at most t plates in total. He may take a...read more

DSA

Arrays

Greedy Algorithms

Minimum Increments To Make Palindrome

Last Updated: 08 July 2026

Given an array of integers arr[] and an integer k. You may freely shuffle the elements of the array and shuffling is not counted as an operation.Find the minimum of number...read more

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