delete pics to save space

1.2054.cpp

@@ -0,0 +1,41 @@
+#include<cstdio>
+#include<algorithm>
+#include<cassert>
+using namespace std;
+typedef long long LL;
+LL n,m,l,mod;
+inline LL mmul(LL a,LL b,LL m=mod)
+{
+	LL d=((long double)a/m*b+1e-8);
+	LL r=a*b-d*m;
+	return r<0?r+m:r;
+}
+LL phi(LL x)
+{
+	LL res=1;
+	for(LL i=2;i*i<=x;i++)
+		if(x%i==0)
+		{
+			res=res*(i-1);
+			while(x%i==0) res=res*i,x/=i;
+		}
+	if(x>1) res=res*(x-1);
+	return res;
+}
+LL ksm(LL a,LL n)
+{
+	LL res=1;
+	for(;n;n>>=1,a=mmul(a,a)) n&1?res=mmul(res,a):0;
+	return res;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%lld%lld%lld",&n,&m,&l);
+	mod=n+1;
+	LL res=mmul(l,ksm(ksm(2,phi(mod)-1),m));
+	printf("%lld\n",res?res:mod);
+	return 0;
+}