Driver code
if __name__ == " _ _ main _ _ " : NEW_LINE INDENT a = [ 1 , 2 , 1 , 2 , 3 ] ; NEW_LINE n = len ( a ) ; NEW_LINE if ( isPossible ( a , n ) ) : NEW_LINE INDENT print ( " Yes " ) ; NEW_LINE DEDENT else : NEW_LINE INDENT print ( " No " ) ; NEW_LINE DEDENT DEDENT