Educational Codeforces Round 5 C. The Labyrinth
Educational Codeforces Round 5 D. Longest k-Good Segment
Codeforces Round #340 (Div. 2) C. Watering Flowers
Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) C. Constellation
Bathwater
Air Blimp
A-E Hash Function
Palindromic Numbers
Expected Weight
F - typewriter