Contest 1 Problem

Contest 1:
1. 1097B - Petr and a Combination Lock
2. 550B - Preparing Olympiad
3. Chef and Queries Problem Code: CHEFQUE
4. 1202A - You Are Given Two Binary Strings...
5. 579A - Raising Bacteria
6. 467B - Fedor and New Game
7. 1095C - Powers Of Two
8. 1151B - Dima and a Bad XOR
9. 158A - Next Round
10. 486A - Calculating Function