privatebrycehao
diff --git a/‎BFS/207.Course-Schedule/Readme.md‎
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@@ -20,6 +20,7 @@ DFS的基本思想是从任意一个未访问过的节点开始做DFS的遍历
 ```cpp
  bool dfs(int cur)
  {
+ if (visited[cur]==1) return true;
  visited[cur] = 2;
  for (int next: graph[cur])
  {
Original file line number	Diff line number	Diff line change
`@@ -20,6 +20,7 @@ DFS的基本思想是从任意一个未访问过的节点开始做DFS的遍历`
`20`	`20`	```cpp
`21`	`21`	`bool dfs(int cur)`
`22`	`22`	`{`
	`23`	`+ if (visited[cur]==1) return true;`
`23`	`24`	`visited[cur] = 2;`
`24`	`25`	`for (int next: graph[cur])`
`25`	`26`	`{`