提交 d83ef01a 编写于 作者: 每日一练社区's avatar 每日一练社区

update exercises

上级 4914ab7c
......@@ -8,13 +8,9 @@
```
3
/ \
9 20
/ \
15 7
```
......@@ -22,13 +18,9 @@
```
[
[3],
[20,9],
[15,7]
]
```
......
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