1 更快些
by ElevenX @ 2017-10-22 20:18:08
```cpp
ll ksm(ll x,ll n, ll mod){
ll ret = x;
for(--n;n;n>>=1,x=x*x%mod)
if(n&1) ret=ret*x%mod;
return ret;
}
```
by 青衫白叙 @ 2017-10-22 20:20:39