text: Longest subsequence from an array of pairs having first element increasing and second element decreasing . | Function to find the length of the longest subsequence of pairs whose first element is increasing and second is decreasing ; dp [ i ] : Stores the longest subsequence upto i ; Base case ; When the conditions hold ; Finally , prthe required answer ; Driver Code ; Given Input ; Function Call
code: def longestSubSequence ( A , N ) : NEW_LINE INDENT dp = [ 0 ] * N NEW_LINE for i in range ( N ) : NEW_LINE INDENT dp [ i ] = 1 NEW_LINE for j in range ( i ) : NEW_LINE INDENT if ( A [ j ] [ 0 ] < A [ i ] [ 0 ] and A [ j ] [ 1 ] > A [ i ] [ 1 ] ) : NEW_LINE INDENT dp [ i ] = max ( dp [ i ] , dp [ j ] + 1 ) NEW_LINE DEDENT DEDENT DEDENT print ( dp [ N - 1 ] ) NEW_LINE DEDENT if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT A = [ [ 1 , 2 ] , [ 2 , 2 ] , [ 3 , 1 ] ] NEW_LINE N = len ( A ) NEW_LINE longestSubSequence ( A , N ) NEW_LINE DEDENT