delete pics to save space

2.11971.cpp

@@ -0,0 +1,26 @@
+#include<cstdio>
+typedef long long LL;
+LL gcd(LL a,LL b)
+{
+	return b==0?a:gcd(b,a%b);
+}
+int n,k,T;
+LL a,b;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&T);
+	for(int i=1;i<=T;i++)
+	{
+		scanf("%d%d",&n,&k);
+		b=1ll<<k;
+		a=b-k-1;
+		LL g=gcd(a,b);
+		a/=g;
+		b/=g; 
+		printf("Case #%d: %lld/%lld\n",i,a,b);
+	}
+	return 0;
+}