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Re:看看为什么wa,跟ac程序对拍都没问题In Reply To:看看为什么wa,跟ac程序对拍都没问题 Posted by:2008__ at 2008-08-07 22:52:14 > #include<stdio.h>
>
> __int64 c[33]={0};
>
> int binary(long n,int bin[33])
> {
> int t[33];
> int i;
> int L;
> L=0;
> while(n!=0)
> {
> t[L++]=n%2;
> n/=2;
> }
> for(i=0;i<L;i++)
> {
> bin[i]=t[L-i-1];
> }
> return L;
> }
>
> __int64 Cmn(int m,int n)
> {
> __int64 count;
> int i;
> if(m==0||m<n)
> return 0;
> if(n==0)
> return 1;
> count=m;
> for(i=1;i<n;i++)
> {
> count=count*(m-i)/i;
> }
> count/=i;
> return count;
> }
>
> __int64 sub(long N)
> {
> int bin[33];
> int one;
> int L;
> int i,j;
> int m,n;
> __int64 count;
> L=binary(N,bin);
> count=c[L];
> one=0;
> for(i=0;i<L;i++)
> {
> if(bin[i]==1)
> one++;
> if(bin[i]==0)
> {
> m=L-i-1;
> n=L/2-one-1;
> if(n>=0)
> {
> for(j=0;j<=n;j++)
> {
> count-=Cmn(m,j);
> }
> }
> }
> }
> if(n>=0&&bin[L-1]==0)count--;
> return count;
> }
>
> int main()
> {
> long a,b;
> __int64 r;
> __int64 count;
> int i,j;
> for(i=2;i<32;i++)
> {
> count=0;
> for(j=0;j<i/2;j++)
> {
> count+=Cmn(i-1,j);
> }
> c[i]=c[i-1]+count;
> }
> while(scanf("%ld%ld",&a,&b)!=EOF)
> {
> r=sub(b)-sub(a-1);
> printf("%ld\n",r);
> }
> return 0;
> }
你求组合的时候出问题了。
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