- #include<iostream>
- #include<string>
- #include<iomanip>
- #include<algorithm>
- using namespace std;
- #define MAXN 9999
- #define MAXSIZE 10
- #define DLEN 4
- class BigNum
- {
- private:
- int a[500]; //可以控制大数的位数
- int len; //大数长度
- public:
- BigNum(){ len = 1;memset(a,sizeof(a)); } //构造函数
- BigNum(const int); //将一个int类型的变量转化为大数
- BigNum(char*); //将一个字符串类型的变量转化为大数
- const BigNum &); //拷贝构造函数
- BigNum &operator=(const BigNum &); //重载赋值运算符,大数之间进行赋值运算
- friend istream& operator>>(istream&, BigNum&); //重载输入运算符
- friend ostream& operator<<(ostream&,0); background-color:inherit">//重载输出运算符
- BigNum operator+(const BigNum &) const; //重载加法运算符,两个大数之间的相加运算
- BigNum operator-(//重载减法运算符,两个大数之间的相减运算
- BigNum operator*(//重载乘法运算符,两个大数之间的相乘运算
- BigNum operator/(int &) const; //重载除法运算符,大数对一个整数进行相除运算
- BigNum operator^(int &) //大数的n次方运算
- int operator%(//大数对一个int类型的变量进行取模运算
- bool operator>(const BigNum & T)//大数和另一个大数的大小比较
- int & t)const; //大数和一个int类型的变量的大小比较
- void print(); //输出大数
- };
- BigNum::BigNum(int b) {
- int c,d = b;
- len = 0;
- memset(a,153); font-weight:bold; background-color:inherit">sizeof(a));
- while(d > MAXN)
- {
- c = d - (d / (MAXN + 1)) * (MAXN + 1);
- d = d / (MAXN + 1);
- a[len++] = c;
- }
- a[len++] = d;
- }
- BigNum::BigNum(char*s) {
- int t,k,index,l,i;
- l=strlen(s);
- len=l/DLEN;
- if(l%DLEN)
- len++;
- index=0;
- for(i=l-1;i>=0;i-=DLEN)
- {
- t=0;
- k=i-DLEN+1;
- if(k<0)
- k=0;
- for(int j=k;j<=i;j++)
- t=t*10+s[j]-'0';
- a[index++]=t;
- }
- const BigNum & T) : len(T.len) //拷贝构造函数
- int i;
- sizeof(a));
- for(i = 0 ; i < len ; i++)
- a[i] = T.a[i];
- }
- BigNum & BigNum::operator=(const BigNum & n) //重载赋值运算符,大数之间进行赋值运算
- {
- int i;
- len = n.len;
- for(i = 0 ; i < len ; i++)
- a[i] = n.a[i];
- return *this;
- istream& operator>>(istream & in, BigNum & b) char ch[MAXSIZE*4];
- int i = -1;
- in>>ch;
- int l=strlen(ch);
- int count=0,sum=0;
- for(i=l-1;i>=0;)
- sum = 0;
- int t=1;
- int j=0;j<4&&i>=0;j++,i--,t*=10)
- {
- sum+=(ch[i]-'0')*t;
- }
- b.a[count]=sum;
- count++;
- b.len =count++;
- return in;
- ostream& operator<<(ostream& out, BigNum& b) //重载输出运算符
- int i;
- cout << b.a[b.len - 1];
- for(i = b.len - 2 ; i >= 0 ; i--)
- {
- cout.width(DLEN);
- cout.fill('0');
- cout << b.a[i];
- }
- return out;
- BigNum BigNum::operator+(const BigNum & T) const //两个大数之间的相加运算
- BigNum t(*this);
- int i,big; //位数
- big = T.len > len ? T.len : len;
- for(i = 0 ; i < big ; i++)
- t.a[i] +=T.a[i];
- if(t.a[i] > MAXN)
- {
- t.a[i + 1]++;
- t.a[i] -=MAXN+1;
- }
- }
- if(t.a[big] != 0)
- t.len = big + 1;
- else
- t.len = big;
- return t;
- }
- BigNum BigNum::operator-(//两个大数之间的相减运算
- {
- bool flag;
- BigNum t1,t2;
- if(*this>T)
- t1=*this;
- t2=T;
- flag=0;
- else
- t1=T;
- t2=*this;
- flag=1;
- big=t1.len;
- for(i = 0 ; i < big ; i++)
- if(t1.a[i] < t2.a[i])
- j = i + 1;
- while(t1.a[j] == 0)
- j++;
- t1.a[j--]--;
- while(j > i)
- t1.a[j--] += MAXN;
- t1.a[i] += MAXN + 1 - t2.a[i];
- }
- t1.a[i] -= t2.a[i];
- t1.len = big;
- while(t1.a[t1.len - 1] == 0 && t1.len > 1)
- t1.len--;
- big--;
- if(flag)
- t1.a[big-1]=0-t1.a[big-1];
- return t1;
- }
- BigNum BigNum::operator*(//两个大数之间的相乘运算
- BigNum ret;
- int temp,temp1;
- up = 0;
- for(j = 0 ; j < T.len ; j++)
- temp = a[i] * T.a[j] + ret.a[i + j] + up;
- if(temp > MAXN)
- {
- temp1 = temp - temp / (MAXN + 1) * (MAXN + 1);
- up = temp / (MAXN + 1);
- ret.a[i + j] = temp1;
- }
- up = 0;
- ret.a[i + j] = temp;
- }
- if(up != 0)
- ret.a[i + j] = up;
- ret.len = i + j;
- while(ret.a[ret.len - 1] == 0 && ret.len > 1)
- ret.len--;
- return ret;
- BigNum BigNum::operator/(int & b) //大数对一个整数进行相除运算
- BigNum ret;
- for(i = len - 1 ; i >= 0 ; i--)
- ret.a[i] = (a[i] + down * (MAXN + 1)) / b;
- down = a[i] + down * (MAXN + 1) - ret.a[i] * b;
- ret.len = len;
- int BigNum::operator %(const //大数对一个int类型的变量进行取模运算
- for (i = len-1; i>=0; i--)
- d = ((d * (MAXN+1))% b + a[i])% b;
- return d;
- BigNum BigNum::operator^(int & n) //大数的n次方运算
- BigNum t,ret(1);
- int i;
- if(n<0)
- exit(-1);
- if(n==0)
- return 1;
- if(n==1)
- int m=n;
- while(m>1)
- t=*for( i=1;i<<1<=m;i<<=1)
- t=t*t;
- m-=i;
- ret=ret*t;
- if(m==1)
- ret=ret*(*this);
- return ret;
- bool BigNum::operator>(int ln;
- if(len > T.len)
- return true;
- else if(len == T.len)
- {
- ln = len - 1;
- while(a[ln] == T.a[ln] && ln >= 0)
- ln--;
- if(ln >= 0 && a[ln] > T.a[ln])
- true;
- false;
- false;
- bool BigNum::operator >(int & t) //大数和一个int类型的变量的大小比较
- BigNum b(t);
- this>b;
- void BigNum::print() //输出大数
- int i;
- cout << a[len - 1];
- for(i = len - 2 ; i >= 0 ; i--)
- cout << a[i];
- cout << endl;
- int main(void)
- BigNum x[101]; //定义大数的对象数组
- x[0]=1;
- for(i=1;i<101;i++)
- x[i]=x[i-1]*(4*i-2)/(i+1);
- while(scanf("%d",&n)==1 && n!=-1)
- x[n].print();
- }
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