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奇怪的问题AC代码如下:(注释的那行不会影响结果,但是如果不注释就会出错。。。。求解脱!!!)
#include<cstdio>
int c[33][33],dp[33][33];
void init()
{
int i,j;
c[0][0]=1;
for(i=1;i<=32;i++)
{
c[i][0]=1;
for(j=1;j<=i;j++) c[i][j]=c[i-1][j-1]+c[i-1][j];
dp[i][0]=1;
////////////////for(j=1;j<=i;j++) dp[i][j]=dp[i-1][j]+dp[i][j-1];
}
}
int length(int n)
{
int ret=0;
while(n)
{
n>>=1;
ret++;
}
return ret;
}
int cnt(int n)
{
if(n<=1) return 0;
int ans=0,len=length(n),i,j,n2;
int nu=(len>>1)+(len&1),one=1,zero=0;
for(i=2;i<len;i++)
{
n2=(i>>1)+(i&1);
for(j=n2;j<i;j++)
ans+=c[i-1][j];
}
for(i=2;i<=len;i++)
{
if((n&(1<<(len-i)))==0){zero++;continue;}
for(j=nu-zero-1;j+i<=len;j++)
ans+=c[len-i][j];
one++;
}
return ans;
}
int main()
{
init();
int a,b;
scanf("%d%d",&a,&b);
printf("%d\n",cnt(b+1)-cnt(a));
return 0;
}
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