text: Form minimum number from given sequence | Python3 program to print minimum number that can be formed from a given sequence of Is and Ds ; min_avail represents the minimum number which is still available for inserting in the output vector . pos_of_I keeps track of the most recent index where ' I ' was encountered w . r . t the output vector ; Vector to store the output ; Cover the base cases ; Traverse rest of the input ; Print the number ; Driver code
code: def printLeast ( arr ) : NEW_LINE INDENT min_avail = 1 NEW_LINE pos_of_I = 0 NEW_LINE v = [ ] NEW_LINE if ( arr [ 0 ] == ' I ' ) : NEW_LINE INDENT v . append ( 1 ) NEW_LINE v . append ( 2 ) NEW_LINE min_avail = 3 NEW_LINE pos_of_I = 1 NEW_LINE DEDENT else : NEW_LINE INDENT v . append ( 2 ) NEW_LINE v . append ( 1 ) NEW_LINE min_avail = 3 NEW_LINE pos_of_I = 0 NEW_LINE DEDENT for i in range ( 1 , len ( arr ) ) : NEW_LINE INDENT if ( arr [ i ] == ' I ' ) : NEW_LINE INDENT v . append ( min_avail ) NEW_LINE min_avail += 1 NEW_LINE pos_of_I = i + 1 NEW_LINE DEDENT else : NEW_LINE INDENT v . append ( v [ i ] ) NEW_LINE for j in range ( pos_of_I , i + 1 ) : NEW_LINE INDENT v [ j ] += 1 NEW_LINE DEDENT min_avail += 1 NEW_LINE DEDENT DEDENT print ( * v , sep = ' ▁ ' ) NEW_LINE DEDENT printLeast ( " IDID " ) NEW_LINE printLeast ( " I " ) NEW_LINE printLeast ( " DD " ) NEW_LINE printLeast ( " II " ) NEW_LINE printLeast ( " DIDI " ) NEW_LINE printLeast ( " IIDDD " ) NEW_LINE printLeast ( " DDIDDIID " ) NEW_LINE