text: Longest subsequence from an array of pairs having first element increasing and second element decreasing . | Python 3 program for the above approach ; Recursive function to find the length of the longest subsequence of pairs whose first element is increasing and second is decreasing ; Base case ; Not include the current pair in the longest subsequence ; Including the current pair in the longest subsequence ;  ; Driver Code ; Given Input ; Function Call
code: import sys NEW_LINE def longestSubSequence ( A , N , ind = 0 , lastf = - sys . maxsize - 1 , lasts = sys . maxsize ) : NEW_LINE INDENT if ( ind == N ) : NEW_LINE INDENT return 0 NEW_LINE DEDENT ans = longestSubSequence ( A , N , ind + 1 , lastf , lasts ) NEW_LINE if ( A [ ind ] [ 0 ] > lastf and A [ ind ] [ 1 ] < lasts ) : NEW_LINE INDENT ans = max ( ans , longestSubSequence ( A , N , ind + 1 , A [ ind ] [ 0 ] , A [ ind ] [ 1 ] ) + 1 ) NEW_LINE DEDENT return ans NEW_LINE DEDENT / * Function * / NEW_LINE public static int longestSubSequence ( int [ , ] A , int N ) NEW_LINE { return longestSubSequence ( A , N , 0 , 0 , 0 ) ; } NEW_LINE if __name__ == " _ _ main _ _ " : NEW_LINE INDENT A = [ [ 1 , 2 ] , [ 2 , 2 ] , [ 3 , 1 ] ] NEW_LINE N = len ( A ) NEW_LINE print ( longestSubSequence ( A , N ) ) NEW_LINE DEDENT