File tree 3 files changed +70
-0
lines changed
3 files changed +70
-0
lines changed Original file line number Diff line number Diff line change @@ -31,3 +31,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
31
31
| 88. Merge Sorted Array | [ Link] ( https://leetcode.com/problems/merge-sorted-array/ ) | [ Link] ( ./lib/easy/merge_sorted_array.dart ) |
32
32
| 94. Binary Tree Inorder Traversal | [ Link] ( https://leetcode.com/problems/binary-tree-inorder-traversal/ ) | [ Link] ( ./lib/easy/binary_tree_inorder_traversal.dart ) |
33
33
| 100. Same Tree | [ Link] ( https://leetcode.com/problems/same-tree/ ) | [ Link] ( ./lib/easy/same_tree.dart ) |
34
+ | 101. Symmetric Tree | [ Link] ( https://leetcode.com/problems/symmetric-tree/ ) | [ Link] ( ./lib/easy/symmetric_tree.dart ) |
Original file line number Diff line number Diff line change
1
+ // https://leetcode.com/problems/symmetric-tree/
2
+ import '../common/tree_node.dart' ;
3
+
4
+ class Solution {
5
+ bool isSymmetric (TreeNode ? root) {
6
+ return _isMirror (root? .left, root? .right);
7
+ }
8
+
9
+ bool _isMirror (TreeNode ? l, TreeNode ? r) {
10
+ if (l != null && r != null && l.val == r.val) {
11
+ return _isMirror (l.left, r.right) && _isMirror (l.right, r.left);
12
+ }
13
+ return l == null && r == null ;
14
+ }
15
+ }
Original file line number Diff line number Diff line change
1
+ import 'package:leetcode_dart/common/tree_node.dart' ;
2
+ import 'package:leetcode_dart/easy/symmetric_tree.dart' ;
3
+ import 'package:test/test.dart' ;
4
+
5
+ void main () {
6
+ group (
7
+ 'Example tests' ,
8
+ () {
9
+ final st = Solution ();
10
+ test (
11
+ 'true' ,
12
+ () => expect (
13
+ true ,
14
+ st.isSymmetric (
15
+ TreeNode (
16
+ 1 ,
17
+ TreeNode (
18
+ 2 ,
19
+ TreeNode (3 ),
20
+ TreeNode (4 ),
21
+ ),
22
+ TreeNode (
23
+ 2 ,
24
+ TreeNode (4 ),
25
+ TreeNode (3 ),
26
+ ),
27
+ ),
28
+ ),
29
+ ),
30
+ );
31
+ test (
32
+ 'false' ,
33
+ () => expect (
34
+ false ,
35
+ st.isSymmetric (
36
+ TreeNode (
37
+ 1 ,
38
+ TreeNode (
39
+ 2 ,
40
+ null ,
41
+ TreeNode (3 ),
42
+ ),
43
+ TreeNode (
44
+ 2 ,
45
+ null ,
46
+ TreeNode (3 ),
47
+ ),
48
+ ),
49
+ ),
50
+ ),
51
+ );
52
+ },
53
+ );
54
+ }
You can’t perform that action at this time.
0 commit comments