How should we go and solve this question. Not able to understand the video explanation and also the editorial solution.
Able to understand question but not the approach
Think of a dp approach. There will be two states in dp: the current index at which you are present , number of ways of getting even and odd sum upto that index.
dp[i][0]: We are at index i and number of ways of getting even sum till i.
dp[i][1]: We are at index i and number of ways of getting odd sum till i.
Now, try to solve this question.
@1shubhamjoshi1 A pure combinatorial approach would be difficult in this question, as a straight formula might be tough to think about. Try to think in terms of what you have now, and what would be added to the answer after you get a pair.here is code snippet.
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