Contest Clarifications

Problem 1002 4 3 3？

xtulollipop | 2015-10-31 19:17:32Author

4 3 3？

admin | 2015-10-31 19:17:54# 1

No Response

xtulollipop | 2015-10-31 19:21:44# 2

？？？什么意思？当s==t是不是就是-1？