Brain Booster #6

Welcome to the #6 th round of "Brain Booster" programming contest.

Please click on "attend contest" to confirm registration.

Update : 15 minutes extended.

Problem
#1: P1106 A. too easy or three easy
#2: P1095 B. Uncovering the Lone Heart
#3: P1102 C. Odd-Even Game
#4: P1099 D. Which way to go
#5: P1100 E. Substring ABC
#6: P1096 F. Mr. Heart and the XOR Puzzle
#7: P1079 G1. Roy and Query (Easy Version)
#8: P1082 G2. Roy and Query (Hard Version)
#9: P1101 H. Mr. Heart and the Enchanted Lights

Problem