968 添加注释

aQuaYi · aQuaYi · commit ea430d1339ce · 2019-04-13T21:08:36.000+08:00
diff --git a/Algorithms/0968.binary-tree-cameras/binary-tree-cameras.go b/Algorithms/0968.binary-tree-cameras/binary-tree-cameras.go
@@ -18,6 +18,8 @@ func minCameraCover(root *TreeNode) int {
 	res := 0
 	s := check(root, &res)
 	if s == isMonitoredByParent {
+		// root has no parent
+		// so need itself has a camera
 		res++
 	}
 	return res

Original file line number	Diff line number	Diff line change
`@@ -18,6 +18,8 @@ func minCameraCover(root *TreeNode) int {`
`18`	`18`	`res := 0`
`19`	`19`	`s := check(root, &res)`
`20`	`20`	`if s == isMonitoredByParent {`
	`21`	`+ // root has no parent`
	`22`	`+ // so need itself has a camera`
`21`	`23`	`res++`
`22`	`24`	`}`
`23`	`25`	`return res`