how to solve 337A by using dp as it mentioned in its tag ?
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You asked for DP, you will get DP.
Define f(rem,pos,min,max) to be taking rem elements from first pos elements with min as minimum and max as maximum — this function can be calculated using DP. Apply coordinate compression on values to limit min and max to O(n). Total complexity = O(n^4).
http://codeforces.net/contest/337/submission/22187455