Leetcode weekly contest 315 review

None of the questions in this contest had any new concepts or ideas that needed to be revisited.

Question 1: This was an easy question, the basics of programming
https://leetcode.com/contest/weekly-contest-315/problems/largest-positive-integer-that-exists-with-its-negative/

Question 2: This was also an easy question. Did not take much time, just reversing a number
https://leetcode.com/contest/weekly-contest-315/problems/count-number-of-distinct-integers-after-reverse-operations/

Question 3: Again quite an easy idea, not much to implement.
 https://leetcode.com/contest/weekly-contest-315/problems/sum-of-number-and-its-reverse/