454. Kakuro
Time limit per test: 2.75
second(s)
Memory limit: 65536
kilobytes
input: standard
output: standard
Kakuro puzzle is played on a
nx
m grid of "black" and "white" cells. Apart from the top row and leftmost column which are entirely black, the grid has some amount of white cells which form "runs" and some amount of black cells. "Run" is a vertical or horizontal maximal onelined block of adjacent white cells. Each row and column of the puzzle can contain more than one "run". Every white cell belongs to exactly two runs — one horizontal and one vertical run. Each horizontal "run" always has a number in the black halfcell to its immediate left, and each vertical "run" always has a number in the black halfcell immediately above it. These numbers are located in "black" cells and are called "clues".
The rules of the puzzle are simple:
 place a single digit from 1 to 9 in each "white" cell
 each digit may only be used once in each "run"
 for all runs, the sum of all digits in a "run" must match the clue associated with the "run"
Given the grid, your task is to find a solution for the puzzle.
Picture of the first sample input
Picture of the first sample output
Input
The first line of input contains two integers
n and
m (2 ≤
n,
m ≤ 6) — the number of rows and columns correspondingly. Each of the next
n lines contains descriptions of
m cells. Each cell description is one of the following 5character strings:
.....
— "white" cell; XXXXX
— "black" cell with no clues; AA\BB
— "black" cell with one or two clues. AA
is either a 2digit clue for the corresponding vertical run, or XX
if there is no associated vertical run. BB
is either a 2digit clue for the corresponding horizontal run, or XX
if there is no associated horizontal run.
The first row and the first column of the grid will never have any white cells. The given grid will have at least one "white" cell.
It is guaranteed that the given puzzle has at least one solution.
Output
Print
n lines to the output with
m cells in each line. For every "black" cell print '
' (underscore), for every "white" cell print the corresponding digit from the solution. Delimit cells with a single space, so that each row consists of 2m1 characters.
If there are many solutions, you may output any of them.
Example(s)
sample input

sample output

6 6
XXXXX XXXXX 28\XX 17\XX 28\XX XXXXX
XXXXX 22\22 ..... ..... ..... 10\XX
XX\34 ..... ..... ..... ..... .....
XX\14 ..... ..... 16\13 ..... .....
XX\22 ..... ..... ..... ..... XXXXX
XXXXX XX\16 ..... ..... XXXXX XXXXX

_ _ _ _ _ _
_ _ 5 8 9 _
_ 7 6 9 8 4
_ 6 8 _ 7 6
_ 9 2 7 4 _
_ _ 7 9 _ _

sample input

sample output

3 3
XXXXX 04\XX XXXXX
XX\04 ..... XXXXX
XXXXX XXXXX XXXXX

_ _ _
_ 4 _
_ _ _
