拓展欧拉定理有应用条件。
要想a^b === a^(b % phi(p) + phi(p)) (mod p)成立，
需要b > phi(p)。
题解里面写的有了。
by __stdcall @ 2017-10-22 17:45:29
orz mjl
by zcysky @ 2017-10-22 18:49:24
```cpp
return PowMod(now%p,Calc(l+1,r,phi[p])+phi[p],p);
```
错了吧
by _Veritas @ 2021-02-05 23:03:18