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奇怪的问题

Posted by xiaoshua at 2011-07-04 20:32:48 on Problem 3252
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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