问题描述
我了解尾递归是什么,但我无法将此方法转换为尾递归。我正在尝试计算矩阵中有多少相邻元素。因此,我的问题是如何将其转化为尾递归?
public static int ExploreAndLabelColony(char[][] grid,int i,int j,char c,int count) {
grid[i][j] = c;
count = 1;
if ((i>0 && i<grid.length && j<grid[0].length) && (grid[i-1][j] == '1')) { //vertical bottom
count +=ExploreAndLabelColony(grid,i-1,j,c,count);
}
if (i+1<grid.length && j<grid[0].length && grid[i+1][j] == '1') { //vertical top
count+=ExploreAndLabelColony(grid,i+1,count);
}
if (j>0 && i<grid.length && j<grid[0].length && grid[i][j-1] == '1') { //horizontal left
count +=ExploreAndLabelColony(grid,i,j-1,count);
}
if (i<grid.length && j+1<grid[0].length && grid[i][j+1] == '1') { //horizontal right
count+=ExploreAndLabelColony(grid,j+1,count);
}
if (i+1<grid.length && j+1<grid[0].length && grid[i+1][j+1] == '1') { //diagonal bottom right
count+=ExploreAndLabelColony(grid,count);
}
if (j>0 && i+1<grid.length && j<grid[0].length && grid[i+1][j-1] == '1') { //diagonal bottom right
count+=ExploreAndLabelColony(grid,count);
}
if (i>0 && i<grid.length && j+1<grid[0].length && grid[i-1][j+1] == '1') { //diagonal top right
count+=ExploreAndLabelColony(grid,count);
}
if (i>0 && j>0 && i<grid.length && j<grid[0].length && grid[i-1][j-1] == '1') { //diagonal top left
count+=ExploreAndLabelColony(grid,count);
}
return count;
}
解决方法
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