Thank you to everyone who participated in the onsite and the open mirror! Congratulations to ikaurov, serichaoo, and Ryazimn for winning the onsite!

There is now a gym for upsolving: https://codeforces.me/gym/106785. Here are the solutions:

106785A - Balanced Tripartition

106785B - Rutgers Bus Budgeting

106785C - Lucyyx Never Clear

106785D - Generatable Sequences

106785E - Non-Similar Paths

106785F - Permutation Edit Distance

106785G - Illuminating Lights

106785H - Stringmaster

106785I - Increasing Tree Jumps

106785J - John Buck Legends

106785K - 3D Turf War

106785L - Skyline

106785M - Balancing Thomas

106785N - MEX of XOR

106785O - Squaremas