School Personal Contest #1 (Winter Computer School 2010/11) - Codeforces Beta Round 38 (ACM-ICPC Rules) D. Vasya the Architect
Codeforces Beta Round 40 (Div. 2) D. Pawn
Codeforces Beta Round 40 (Div. 2) E. 3-cycles
School Team Contest 3 (Winter Computer School 2010/11) C. Dancing Lessons
School Team Contest 3 (Winter Computer School 2010/11) D. Event Dates
Cheapest items
Bitwise OR
A largest subset
A binary palindrome
A smallest number