Problem↵
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You are given two vectors A and B, for each `1 <= k <= 2*N` we want to find out C[k] where C[k] is sum of all `A[i]*B[j]` such that `i + j == k`.<br>↵
Constraints↵
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` N <= 1e6 `
==================↵
↵
You are given two vectors A and B, for each `1 <= k <= 2*N` we want to find out C[k] where C[k] is sum of all `A[i]*B[j]` such that `i + j == k`.<br>↵
Constraints↵
------------------↵
` N <= 1e6 `
