@[Most_Ima](/user/236862) 我下午刚过了这题，帮你看看吧
by Ginger_he @ 2022-01-15 00:20:25
不过我是用记搜的
by Ginger_he @ 2022-01-15 00:20:41
@[Most_Ima](/user/236862) 改成这样
```cpp
printf("%lld\n",solve(r)-solve(l-1));
```
by Ginger_he @ 2022-01-15 00:22:04
@[Ginger_he](/user/379058) 我的solve是求小于 x 的答案数啊
by DitaMirika @ 2022-01-15 10:51:59
@[Most_Ima](/user/236862) 有可能 $x$ 本身也是符合条件的答案
by Ginger_he @ 2022-01-15 13:13:42
@[Ginger_he](/user/379058) 我的 $solve$ 是求 $1$ 到 $x-1$ 的答案数。
by DitaMirika @ 2022-01-15 15:50:37