About the sample input

#1

sir , in sample input , it is given

1 2 3 4 5

which means the sequence is only increasing ,so how this could be both decreasing and increasing as it is given true in sample output ???

#2

Hey @gargshivam2001

  • A sequence is true if you can split it into two sub sequence such that first sequence is strictly increasing and second sequence is strictly decreasing.
  • For e.g.,
    1 2 3 4 5
    This sequence is also true as we can split it into two sequence like., sequence one is empty and sequence two is 1 2 3 4 5.
  • Let’s take another example.,
    5 4 3 2 1
    This is also true as we can split it such that sequence one is5 4 3 2 1 and sequence two is empty.
    According to the problem statement, we can say the if the sequence decreases then it should not increase, if this is the case one can directly print false else print true.
  • The third case is when the sequence is first strictly decreasing then strictly increasing.
    For example :
    9 5 2 7 10
    The sequence first decreases starting from 9 to 2 - { 9, 5, 2 } and then starts increasing - { 7, 10}. Note that it can also be broken as { 9, 5} and { 2, 7, 10} .
    Since the sequence fulfills the required condition , we would also print “true” for this.

If a sequence does not meet any of the above criteria , we return “false” for it.

#3

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