Update 0200.岛屿数量.深搜版 Go 版本

problems/0200.岛屿数量.深搜版.md

@@ -219,7 +219,7 @@ class Solution {
 }
 ```
 
-Python:
+### Python:
 
 ```python
 # 版本一
@@ -279,6 +279,56 @@ class Solution:
         return result
 ```
 
+### Go
+
+```go
+func numIslands(grid [][]byte) int {
+    // 用1标记已访问
+    visited := make([][]int, len(grid))
+    for i := 0; i < len(visited); i++{
+        visited[i] = make([]int, len(grid[0]))
+    }
+
+    var bfs func(x, y int)
+    bfs = func(x, y int){
+        stack := make([][]int, 0)
+        stack = append(stack, []int{x, y})
+        moveX := []int{1, -1, 0, 0}
+        moveY := []int{0, 0, 1, -1} 
+
+        for len(stack) != 0{
+            node := stack[len(stack) - 1]
+            stack = stack[:len(stack) - 1]
+
+            for i := 0; i < 4; i++{
+                dx := moveX[i] + node[0]
+                dy := moveY[i] + node[1]
+                if dx < 0 || dx >= len(grid) || dy < 0 || dy >= len(grid[0]) || visited[dx][dy] == 1{
+                    continue
+                }
+                visited[dx][dy] = 1
+                if grid[dx][dy] == '1'{
+                    stack = append(stack, []int{dx,dy})
+                }
+            }
+        }
+    }
+
+    result := 0
+    for i := 0; i < len(grid); i++{
+        for j := 0; j < len(grid[0]); j++{
+            if visited[i][j] == 0 && grid[i][j] == '1'{
+                bfs(i, j)
+                visited[i][j] = 1
+                result++
+            }
+        }
+    }
+
+    return result
+}
+```
+
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