text: Arrange given numbers to form the smallest number | Utility function to print the contents of an array ; A comparison function that return true if ' AB ' is smaller than ' BA ' when we concatenate two numbers ' A ' and ' B ' For example , it will return true if we pass 12 and 24 as arguments . This function will be used by sort ( ) function ; Convert first number to string format ; Convert second number to string format ; Check if ' AB ' is smaller or ' BA ' and return bool value since comparison operator ' < = ' returns true or false ;  ; Function to print the arrangement with the smallest value ; If we pass the name of the comparison function it will sort the array according to the compare function ; Print the sorted array ; Driver code
code: def printArr ( arr , n ) : NEW_LINE INDENT for i in range ( 0 , n ) : NEW_LINE INDENT print ( arr [ i ] , end = " " ) NEW_LINE DEDENT DEDENT def compare ( num1 , num2 ) : NEW_LINE INDENT A = str ( num1 ) NEW_LINE B = str ( num2 ) NEW_LINE return int ( A + B ) <= int ( B + A ) NEW_LINE DEDENT def sort ( arr ) : NEW_LINE INDENT for i in range ( len ( arr ) ) : NEW_LINE INDENT for j in range ( i + 1 , len ( arr ) ) : NEW_LINE INDENT if compare ( arr [ i ] , arr [ j ] ) == False : NEW_LINE INDENT arr [ i ] , arr [ j ] = arr [ j ] , arr [ i ] NEW_LINE DEDENT DEDENT DEDENT DEDENT def printSmallest ( N , arr ) : NEW_LINE INDENT sort ( arr ) NEW_LINE printArr ( arr , N ) NEW_LINE DEDENT if __name__ == " _ _ main _ _ " : NEW_LINE INDENT arr = [ 5 , 6 , 2 , 9 , 21 , 1 ] NEW_LINE N = len ( arr ) NEW_LINE printSmallest ( N , arr ) NEW_LINE DEDENT