Triplets with Sum between given range
Flip Array
Shortest common superstring
C - Iroha’s Obsession
B - Box and Ball
B - A < AP
C - Two Alpinists
C - Knot Puzzle
Codeforces Beta Round #80 (Div. 1 Only) B. Cthulhu
Codeforces Beta Round #86 (Div. 2 Only) B. PFAST Inc.