帮忙看一下
#include<iostream.h>
#include<stdlib.h>
#define M 20
int Bit(unsigned long int p)
{
	int bit=0;
	while(p!=0)
	{
		p=p/10;
		bit++;
	}
	return bit;
}
class Longint
{
public:
	Longint()
	{
		for(int i=0;i<M;i++) num[i]=0;
	}
	Longint operator =(Longint other)
	{
		for(int i=0;i<M;i++) num[i]=other.num[i];
		return *this;
	}
	Longint(int i)
	{
        for(int j=0;j<M-1;j++) num[j]=0;
		num[M-1]=i;
	}
	friend Longint operator +(Longint p,Longint other)
	{
		Longint p1;
		int bit=0;
		for(int i=M-1;i>=0;i--)
		{
			p1.num[i]=p.num[i]+other.num[i]+bit;
			if(p1.num[i]>=1000000000)
			{
				p1.num[i]=p1.num[i]-1000000000;
				bit=1;
			}
			else bit=0;
		}
		return p1;
	}
	friend ostream& operator <<(ostream& out,Longint& p)
	{
		int i=0;
		while(p.num[i]==0&&i<M) i++;
		if(i==M) out<<0;
		else
		{
			out<<p.num[i];
		    for(int j=i+1;j<M;j++)
			{
			for(int bit=1;bit<=9-Bit(p.num[j]);bit++) out<<0;
			out<<p.num[j];
			}
		}
		return out;
	}
private:
	unsigned long int num[M];
};
Longint tab[52][52];
int main()
{
	Longint a[50];
	int i,k,j,t;
	Longint s;
	for(i=0;i<52;i++)
	{
		tab[i][1]=Longint(1);
		tab[i][0]=Longint(0);
	}
	for(i=0;i<52;i++)
	{
		for(k=i+1;k<52;k++) tab[i][k]=Longint(0);
	}
	for(i=2;i<52;i++)
	{
		for(k=2;k<=i;k++)
		{
			s=Longint(0);
			for(j=1;j<=k;j++) s=s+tab[i-1][k];
			for(j=1;j<=2*i-k;j++) s=s+tab[i-1][k-1];
			tab[i][k]=s;
		}
	}
	cin>>t;
	j=0;
	while(t>=1)
	{
		cin>>i>>k;
		if(i==0&&k==0) cout<<1<<endl;
		if(k==1) cout<<1<<endl;
		 else if(k>i||k<1) cout<<0<<endl;
		 else cout<<tab[i][k]<<endl;
		 t--;
	}

	return 0;
}

• Re:为什么错了 (1892) xinghe 2006-05-01 12:03:31
  • Re:为什么错了 (7) xinghe 2006-05-01 12:04:05
    • 怎么没人回答呢 (8) xinghe 2006-05-05 00:30:13
      • 不太明白题意呢 (7) judas 2006-05-05 09:56:31
        • 哪位大牛给点测试数据 (2) xinghe 2006-05-05 16:54:58
          • 你的第一个函数Bit就写错了,Bit(0)=0,0只有0个数字??? (4) xfxyjwf 2006-05-05 17:42:28
            • 感谢帮忙 终于过了 (0) xinghe 2006-05-05 20:51:05