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My bad!! Understood problem statement now.

Thanks :)
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Can someone explain for Problem D:

Answer for input: bccdeefggiaacndddd

should be 2.

But according to solutions it is : 1

My solution for 2 is : (bc)(cd)(e(ef)g)(gi)(a(ac)n)dddd
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Please help me in knowing what two values will change in the second segment tree.

+1

May I know the source of this problem?