Compute the antisigma function
The sum of divisors function, or , is the sum of the numbers that divide . The antisigma function is the sum of numbers less tha...
Most Frequent Characters
Given a document file or a character array, identify the 'n' most frequently occurring characters and the number of times each a...
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Symmetric Pair
Given an (n, 2) matrix, remove any symmetric pairs from the matrix. Keep the first occurrence.
(2, 3) and (3, 2) are considere...
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Unique rows
A matrix is given as the input. Remove any duplicate rows from the matrix. keep the first occurrence.
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Pairs with Given Sum
Given an array of integers and a target sum, return all unique pairs whose sum is equal to the target. The output should be a ma...
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Last Duplicate
Given an array of integers, find the last duplicate element — that is, the element whose second occurrence appears latest in the...
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Dominant Matrix - 02
It is a follow-up of the problem 55995. There, you found out whether a matrix is diagonally dominant or not.
In this problem, y...
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First Duplicate
Given an array of integers, return the first duplicate — i.e., the element that appears more than once and whose second appearan...
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'X'avier
Given a square matrix A of size n, write a function to create a new matrix B where only the elements on the main diagonal and th...
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Greater than before
Given an array of integers, write a function that returns elements that are greater than the one before them.
For instance,
...
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Intersect three sequences
Most numbers have interesting properties, if you look hard enough and interpret “interesting” liberally. Let’s choose a number a...