char mark = 'A';
for(i from 0 to rows)
colstart = 0;
while(colstart = next empty col in ith row)
width = 0;
for(j from colstart to columns)
{
if(empty)
width++;
else
break;
}
if(width == 0)
continue
for(n from colstart to colstart + width)
for(m from i to rows)
if(!empty)
break;
if(m != i)
set the rectangle from i, colstart to m - 1, colstart + width
with mark char and increment mark;
更新：Java 代码。
public class Program
{
public static char occuppied;
public static char vacant;
public static char mark;
public static void main(String[] args)
{
int rows = 7;
int cols = 11;
mark = 'A';
occuppied = '#';
vacant = '-';
char[][] matrix = new char[rows][cols];
setRect(matrix, vacant, 0, 0, rows, cols);
setRect(matrix, occuppied, 3, 3, 2, 2);
setRect(matrix, occuppied, 5, 5, 2, 6);
print(matrix);
for(int i = 0; i < rows; i++)
{
int colstart = 0;
while((colstart = nextEmptyCol(matrix[i], colstart)) != -1)
{
int width = 0;
for(int j = colstart; j < cols; j++)
{
if(matrix[i][j] == vacant)
width++;
else
break;
}
if(width == 0)
continue;
int height = 1;
outer:
for(; height + i < rows; height++)
for(int n = 0; n < width; n++)
{
if(matrix[i + height][colstart + n] == occuppied)
break outer;
}
System.out.println("width = " + width + ", height = " + height);
setRect(matrix, mark, i, colstart, height, width);
print(matrix);
mark++;
}
}
}
public static void setRect(char[][] matrix, char c, int startrow, int startcol, int numrows, int numcols)
{
for(int i = 0; i < numrows; i++)
for(int j = 0; j < numcols; j++)
matrix[startrow + i][startcol + j] = c;
}
public static void print(char[][] matrix)
{
int rows = matrix.length;
int cols = matrix[0].length;
for(int i = 0; i < rows; i++)
{
for(int j = 0; j < cols; j++)
System.out.print(matrix[i][j] + " ");
System.out.println();
}
for(int i = 0; i < cols; i++)
System.out.print("==");
System.out.println();
}
public static int nextEmptyCol(char[] row, int start)
{
for(int i = start; i < row.length; i++)
if(row[i] == vacant)
return i;
return -1;
}
}
