delete pics to save space

2.12716.cpp

@@ -0,0 +1,28 @@
+#include<cstdio>
+const int maxm=30000000;
+int cnt[maxm+1],sum[maxm+1];
+inline void init()
+{
+	for(int c=1;c<=maxm;c++)
+		for(int a=c*2;a<=maxm;a+=c)
+		{
+			int b=a-c;
+			if(c==(a^b)) cnt[a]++;
+		}
+	for(int i=1;i<=maxm;i++) sum[i]=sum[i-1]+cnt[i];
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	init();
+	int T,n,kase=0;
+	scanf("%d",&T);
+	while(T--)
+	{
+		scanf("%d",&n);
+		printf("Case %d: %d\n",++kase,sum[n]);
+	}
+	return 0;
+}