Contest Clarifications

oo00oo | 2017-04-01 19:35:06Author

1 5 1 2 3 2 1 the answer is 2？

admin | 2017-04-01 19:38:29# 1

answer is 2.

admin | 2017-04-01 19:38:37# 2

Yes. For 1 2 3 2 1 One solution is [1 2 3] [2 1] Each number in [ ] is unique.

oo00oo | 2017-04-01 19:39:06# 3

ok . thank you