Codeforces Round 278 (Div. 1) A. Fight the Monster
Independent Rectangles
Increasing Pair
Zone Capture
Dependency Graph
Khans
Codeforces Round 280 (Div. 2) D. Vanya and Computer Game
Rockethon 2015 B2. Permutations
Rockethon 2015 G1. Inversions problem
Codeforces Round 294 (Div. 2) D. A and B and Interesting Substrings