First of all, thank you Codechef for another long challenge. These contests are great. There were a few things i disliked and i would like to point them out. Perhaps others agree with me and it will help improve the quality of the contest even more.
Problems were not balanced: 3 easy, 1 medium but apparently having weak test cases (SEACO), another medium, and 5 hard problems. Huge jump between 5 and 6 problems solved.
Complex problem statements: WEASELTX. It could have been explained much better with a few more sentences instead of those formulas and Delta signs :). Also WEASELSC problem statement was not clear enough, which i understood from the comments section where some great coders asked for explanation.
Too much math in some problems: SEAFUNC and SUMCUBE. I just lost interest after seeing all those formulas honestly.
This is just my humble opinion :).
Have a nice day!