[洛谷P2613] [模板] 有理数取余

 1 #include<cstdio>
 2 #define ll long long
 3 #define mod 19260817
 4 
 5 ll read()
 6 {
 7     ll ret=0;char c=getchar();
 8     while(c<‘0‘||c>‘9‘)c=getchar();
 9     while(c>=‘0‘&&c<=‘9‘)ret=(10*ret+c-‘0‘)%mod,c=getchar();
10     return ret; 
11 }
12 
13 ll ksm(ll b,int p)
14 {
15     ll ret=1;
16     while(p)
17     {
18         if(p&1)ret=(ret*b)%mod;
19         b=(b*b)%mod;
20         p>>=1;
21     }
22     return ret;
23 }
24 
25 int main()
26 {
27     ll a=read(),b=read();
28     ll inv=ksm(b,mod-2);
29     if(!inv)printf("Angry!");
30     else printf("%lld",a*inv%mod);
31     return 0;
32 }