Здравейте,

Имам малък проблем със задача 12. The Matrix. В Judge ми дава 55/100. Всички тестове ми излизат. Опитах и с мои тестове, но резултата е същият. Погледнах примерни решиния на колеги(бяха с рекурсия и не успях да ги разбера много много). Ще съм благодарен ако ударите едно рамо.

Моето решение: https://pastebin.com/iX1vdjbg

Условие:

You are given a matrix (2D array) of lowercase alphanumeric characters (a-z, 0-9), a starting position – defined by a start row startRow and a start column startCol – and a filling symbol fillChar. Let’s call the symbol originally at startRow and startCol the startChar. Write a program, which, starting from the symbol at startRow and startCol, changes to fillChar every symbol in the matrix which:

• is equal to startChar AND
• can be reached from startChar by going up (row – 1), down (row + 1), left (col – 1) and right (col + 1) and “stepping” ONLY on symbols equal startChar

So, you basically start from startRow and startCol and can move either by changing the row OR column (not both at once, i.e. you can’t go diagonally) by 1, and can only go to positions which have the startChar written on them. Once you find all those positions, you change them to fillChar.

In other words, you need to implement something like the Fill tool in MS Paint, but for a 2D char array instead of a bitmap.

Input

On the first line, two integers will be entered – the number R of rows and number C of columns.

On each of the next R lines, C characters separated by single spaces will be entered – the symbols of the Rth row of the matrix, starting from the 0th column and ending at the C-1 column.

On the next line, a single character – the fillChar – will be entered.

On the last line, two integers – startRow and startCol – separated by a single space, will be entered.

Output

The output should consist of R lines, each consisting of exactly C characters, NOT SEPARATED by spaces, representing the matrix after the fill operation has been finished.

Constraints

0 < R, C < 20
0 <= startRow < R
0 <= startCol < C

All symbols in the input matrix will be lowercase alphanumerics (a-z, 0-9). The fillChar will also be alphanumeric and lowercase.

The total running time of your program should be no more than 0.1s

The total memory allowed for use by your program is 5MB

Examples