题目
解题思路
代码
#include<cstdio>
#define rr register
using namespace std
;
int n
; long long ans
;
signed main()
{
scanf("%d",&n
);
for (rr
int i
=1;i
<=n
/2;i
++)
for (rr
int j
=i
*2;j
<=n
;j
+=i
)
if ((i
^j
)==j
-i
) ans
++;
printf("%lld",ans
);
}
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