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Create a prefix array where the ith element of that array will denote the number of odd elements encountered up till ith index .
- A2J007 April 30, 2019Then for every index i suppose the value of the pref[i]=p then use binary search to find the first occurence of a value greater than or equal to p-k . Suppose that index is j . Then j-i+1 is added to the answer .
Complexity O(Nlog2(N)).