delete pics to save space

2.12627.cpp

@@ -0,0 +1,23 @@
+#include<cstdio>
+long long m3[40];
+long long f(int k,int i)
+{
+	if(i<=0) return 0;
+	if(k<=0) return 1;
+	if(i<=(1<<k-1)) return f(k-1,i)*2;
+	return m3[k-1]*2+f(k-1,i-(1<<k-1));
+}
+int K,A,B;
+int main()
+{
+	m3[0]=1;
+	for(int i=1;i<40;i++) m3[i]=m3[i-1]*3;
+	int t;
+	scanf("%d",&t);
+	for(int i=1;i<=t;i++)
+	{
+		scanf("%d%d%d",&K,&A,&B);
+		printf("Case %d: %lld\n",i,f(K,B)-f(K,A-1));
+	}
+	return 0;
+}