1) https://www.hackerrank.com/challenges/plus-minus/problem
2) https://www.hackerrank.com/challenges/cats-and-a-mouse/problem
3) https://leetcode.com/problems/merge-sorted-array/
4) https://leetcode.com/problems/contains-duplicate/description/
5) https://leetcode.com/problems/roman-to-integer/description/
6) https://leetcode.com/problems/majority-element/description/
7) https://leetcode.com/problems/length-of-last-word/description/
8) https://leetcode.com/problems/convert-the-temperature/description/