Number of ways to pair people | Function to find number of ways to pair people in party ; To store count of number of ways . ; Using the recurrence defined find count for different values of p . ; Driver code
def findWays ( p ) : NEW_LINE INDENT dp = [ 0 ] * ( p + 1 ) NEW_LINE dp [ 1 ] = 1 NEW_LINE dp [ 2 ] = 2 NEW_LINE for i in range ( 3 , p + 1 ) : NEW_LINE INDENT dp [ i ] = ( dp [ i - 1 ] + ( i - 1 ) * dp [ i - 2 ] ) NEW_LINE DEDENT return dp [ p ] NEW_LINE DEDENT p = 3 NEW_LINE print ( findWays ( p ) ) NEW_LINE