in the sample input, it is only increasing and not decreasing, so why the output is given as true?
Doubt in sample input
See the input must be first increasing and then decreasing that means in this sample input case there are all the elements in the increasing set and none in decreasing set so the decreasing set is a empty set .So this sample test case is a valid test case.
Just to add please make sure that the sequence is first increasing and then decreasing only. However the increasing or decreasing set may be empty.
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