更新卡码99_增加Python3版本

Author: kimoge

problems/kamacoder/0099.岛屿的数量广搜.md

@@ -192,6 +192,56 @@ int main() {
 
 ### Python
 
+```python
+from collections import deque
+
+# 四个方向
+position = [[0, 1], [1, 0], [0, -1], [-1, 0]]
+
+
+def bfs(grid, visited, x, y):
+    """
+    广度优先搜索对陆地进行标记
+    """
+
+    que = deque()  # 创建队列
+
+    # 标记当前节点并加入队列
+    visited[x][y] = True
+    que.append([x, y])
+
+    while que:
+        cur_x, cur_y = que.popleft()  # 取出队首节点
+        for i, j in position:
+            next_x = cur_x + i
+            next_y = cur_y + j
+            # 下一节点下标越界，跳过
+            if next_x < 0 or next_x >= len(grid) or next_y < 0 or next_y >= len(grid[0]):
+                continue
+            # 下一节点是陆地且未被访问,标记节点并加入队列
+            if grid[next_x][next_y] == 1 and not visited[next_x][next_y]:
+                visited[next_x][next_y] = True
+                que.append([next_x, next_y])
+
+
+n, m = map(int, input().split())
+# 邻接矩阵
+grid = []
+for i in range(n):
+    grid.append(list(map(int, input().split())))
+
+visited = [[False] * m for _ in range(n)]  # 访问表
+
+res = 0
+for i in range(n):
+    for j in range(m):
+        if grid[i][j] == 1 and not visited[i][j]:
+            res += 1
+            bfs(grid, visited, i, j)
+
+print(res)
+```
+
 ### Go
 
 ### Rust