Have a look at this code for the Problem TRIP2 in Ltime75B
https://www.codechef.com/viewsolution/26171591
It got AC on the 70 points subtask with orignal constraints and 0 on 30 points subtask of K=2
Could someone explain how did this happen?
Edit: This seems to be the case with many other codes as well.
In fact, there were more 70 point submissions than 100 point ones.