题解 | #岛屿数量#

```/**
 * 判断岛屿数量
 * @param grid char字符型二维数组 
 * @param gridRowLen int grid数组行数
 * @param gridColLen int* grid数组列数
 * @return int整型
 *
 * C语言声明定义全局变量请加上static，防止重复定义
 */
//注意里面的数字是字符。
void p(char** grid,int gridRowlen,int *gridColLen,int i,int j)
{
    if(i<0||j<0||i==gridRowlen||j==*gridColLen||grid[i][j]=='0')return ;
    grid[i][j]='0';
    p(grid,gridRowlen,gridColLen,i-1,j);
    p(grid,gridRowlen,gridColLen,i,j-1);
    p(grid,gridRowlen,gridColLen,i+1,j);
    p(grid,gridRowlen,gridColLen,i,j+1);
}
int solve(char** grid, int gridRowLen, int* gridColLen ) {
    // write code here
    int count=0;
    for(int i=0;i<gridRowLen;i++)
    {
        for(int j=0;j<*gridColLen;j++)
        {
            if(grid[i][j]=='1')
            {
               p(grid,gridRowLen,gridColLen,i,j);
               count++;
            }
        }
    }
    return count;
}