Does incorrect submissions in long challenge Decrease my current rating? if i participate in codechef long challenge and do some wrong submissions before solving the question correctly and if one of my friend solved the same question in one try. So, will my rating will be the same as that of my friend?
No, Long challenges on codechef follow Score based ranklist.
You can read more about it here
No penalty for wrong answers
You are ranked purely based on your score.
However, your wrong answer TLE WA CE RTE will be present on your profile page.
Thanks for the point 