@[ddgtang](/user/308413)
```
77
74 280
75 266
76 264
77 260
78 239
-1 -1
50
```
输出
```
9
```
by J与M等于Y @ 2020-07-26 11:37:16
@[J与M等于Y](/user/158435)
by ddgtang @ 2020-07-26 12:40:22
谢谢
by ddgtang @ 2020-07-26 12:40:27