Problems from Hong Kong Regional Online Preliminary 2016

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
0-1 Sequences 6185 921 15% 0.01 1215 620 51% 6.8
A+B Problem 6098 607 10% 0.03 862 291 34% 8.3
Boxes 1264 455 36% 0.10 312 258 83% 4.3
Classrooms 1022 270 26% 0.08 225 166 74% 6.3
Crazy Driver 633 255 40% 0.00 201 175 87% 3.6
Curious Cupid 1130 201 18% 0.08 166 113 68% 5.7
Dim Sum 86 35 41% 0.04 36 27 75% 6.5
k-Colouring of a Graph 162 40 25% 0.03 29 21 72% 8.4
Let's Meet 591 113 19% 0.00 85 51 60% 7.9
Palindromes 295 71 24% 0.09 72 32 44% 8.7
Take Two Stones 23236 14072 61% 0.00 11615 11179 96% 1.3