@[韩沛煊](/space/show?uid=47140) 您不知道逆元?
by ViXbob @ 2019-03-06 21:47:04
@[ViXbob](/space/show?uid=50971) 就比如
```
di *= 1/3
```
就直接乘上3的逆元就行？
by 斯茂 @ 2019-03-07 20:07:42
那
```
di += 1/3
```
呢
by 斯茂 @ 2019-03-07 20:08:05
@[韩沛煊](/space/show?uid=47140) 在矩阵中维护一个常量就行了
by ViXbob @ 2019-03-07 22:59:38