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problem solving

Mini-Max Sum challenge https://www.hackerrank.com/challenges/mini-max-sum/problem

Staircase challenge https://www.hackerrank.com/challenges/staircase/problem

Plus Minus challenge https://www.hackerrank.com/challenges/plus-minus/problem

Diagonal Difference challenge https://www.hackerrank.com/challenges/diagonal-difference/problem

Simple Array Sum challenge https://www.hackerrank.com/challenges/simple-array-sum