Hello!
My submission is getting WA on test 21, since there's no editorial I can't see the desired solution and I can't figure out where my mistake is.
Here is the link : http://mirror.codeforces.com/contest/279/submission/20043264
Thanks for help!
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The approach I used is to define R[i] = how much to the right can I go from i so that the elements don't decrease and L[i] = how much to the left can I go from i so that the elements don't decrease. We can compute this in linear time. Then to answer a query, I simply check if R[l] > = L[r].