delete pics to save space

1.4454.cpp

@@ -0,0 +1,40 @@
+#include<cstdio>
+#include<cmath>
+#include<map>
+using namespace std;
+typedef long long LL;
+LL g,p,A,B,a,b,n,m,inv;
+map<LL,int> mp;
+inline LL ksm(LL a,LL b) { LL res=1; for(;b;b>>=1,a=a*a%p) b&1?res=res*a%p:0; return res; }
+inline LL BSGS(LL A,LL B)
+{
+	A%=p; B%=p;
+	for(int i=0;i<m;i++)
+	{
+		if(mp[B]) return (i*m+mp[B])%p;
+		B=B*inv%p;
+	}
+	return -1;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%lld%lld%lld",&g,&p,&n);
+	m=ceil(sqrt(p));
+	LL x=1;
+	for(int i=1;i<=m;i++)
+	{
+		x=x*g%p;
+		mp[x]=i;
+	}
+	inv=ksm(g,p-m-1)%p;
+	while(n-->0)
+	{
+		scanf("%lld%lld",&A,&B);
+		//printf("a=%d b=%d\n",a,b);
+		printf("%lld\n",ksm(B,BSGS(g,A))%p);
+	}
+	return 0;
+}