if suppose in a question we have subtasks
Subtask 1 20 points
Subtask 2 80 points
subtask 1 is easy and 2 is hard
so if i complete only subtask 2 does that mean whole program is wrong ? or just the small portion which is for subtask 1 ?
It means test cases defined in only subtask 1 are failing under the given constraints for it .
But all the test cases in subtask 2 are passing with an Ac verdict . Just look after the constraints ,hope it might help 
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