This is the B. Odd Subarrays of Codeforces Round #794 (Div. 2)
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Dynamic Programming Playlist - https://youtube.com/playlist?list=PLnf_DV97XNw6yHFZQPjAARMuP8AVtSJxV
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Problem Link - https://codeforces.com/contest/1686/problem/B
Solution Link - https://pastebin.com/k6MqirpE
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