This summer, me and kefaa2 held a contest in Petrozavodsk Programming Camp. $$$1$$$ problem was provided by gepardo, and we are very thankful for that, and other problems were created by us, kefaa2 and antontrygubO_o. This contest will be held as an OpenCup contest on September 19, 11:00 UTC+3.
Link (OpenCup login needed to participate)
I will publish the editorial here soon after the contest ends.
Good luck and have fun!