Problems from Hong Kong Regional Online Preliminary 2016

Submissions Users
Name Total Acc. Ratio Fastest Total Acc. Ratio   Difficulty
A+B Problem 4830 489 10% 0.04 709 243 34% 8.2
Palindromes 244 59 24% 0.09 66 31 47% 8.6
0-1 Sequences 4938 739 15% 0.01 980 505 52% 7.1
Let's Meet 485 82 17% 0.00 70 45 64% 7.8
Curious Cupid 1101 184 17% 0.08 158 106 67% 5.7
Classrooms 859 227 26% 0.08 192 140 73% 6.3
k-Colouring of a Graph 151 39 26% 0.03 27 20 74% 8.0
Dim Sum 70 33 47% 0.04 31 25 81% 6.3
Boxes 1148 409 36% 0.10 278 228 82% 4.4
Crazy Driver 617 246 40% 0.00 193 169 88% 3.6
Take Two Stones 18154 11369 63% 0.00 9351 8996 96% 1.2