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Merging Arrays
https://codeforces.com/edu/course/2/lesson/9/1/practice/contest/307092/problem/A
https://ideone.com/p5k2Qp
Sum of Two Values
https://cses.fi/problemset/task/1640/
https://ideone.com/hDkJ5K
Books
https://codeforces.com/problemset/problem/279/B
https://codeforces.com/contest/279/submission/251997572
Subarray Sums I
https://cses.fi/problemset/task/1660/
https://ideone.com/1lC6mR
Maximum distinct
https://codeforces.com/group/T3p02rhrmb/contest/343965/problem/B
https://ideone.com/bgToT2
Tandem Repeats?
https://codeforces.com/contest/1948/problem/D
https://codeforces.com/contest/1948/submission/252000841
