高精度模板

Posted 2020-11-13 wljss

众所周知，高精度一直都是非常不友好滴~，所以wljss在这里为大家提供一下重载后的结构体高精度(可处理负数)，还是非常实用滴^_^.

本模板不定期更新，若有错误之处还望不吝赐教，目前重载的符号有:

1.*:高精度乘法 2.+:高精度加法 3.-:高精度减法 4./:高精除低精 5.>>:高精度cin读入 6.<<:高精度cout输出。

  #include<iostream>
#include<cstring>
#include<cstdlib>
#include<cstdio>
using namespace std;
int m,l,r;
long long b;
char a[5100];
struct gj
{
    int len,zheng;//len：长度 zheng：正负标记0为负1为正 
    int v[10000];
    gj(){len=0;memset(v,0,sizeof(v));zheng=1;}
    gj(int x)
    {
        if(x>=0)zheng=1;
        else x=-x,zheng=0;
        len=0;memset(v,0,sizeof(v));
        while(x)
        {
            v[++len]=x%10;
            x/=10;
        }
    }
    friend bool operator <(const gj &a,const gj &b)
    {
        if(a.len<b.len)return 1;
        if(a.len>b.len)return 0;
        for(int i=a.len;i>=1;--i)
        {
            if(a.v[i]<b.v[i])return 1;
            if(a.v[i]>b.v[i])return 0;
        }
        return 0;
    }
}n;
/*------以下为重载部分------*/ 
ostream& operator << (ostream &out,const gj &a);
istream& operator >> (istream &in,gj &a);
gj operator -(gj a,gj b);
gj operator +(gj a,gj b);
gj operator *(gj a,gj b);

gj operator +(gj a,gj b)
{
    if(!a.zheng&&!b.zheng)
    {
        a.zheng=b.zheng=1;
        gj c=a+b;
        c.zheng=0;
        return c;
    }
    if(!a.zheng&&b.zheng)
    {
        a.zheng=b.zheng=1;
        return b-a;
    }
    if(a.zheng&&!b.zheng)
    {
        a.zheng=b.zheng=1;
        return a-b;
    }
    int len=a.len+b.len;
    gj c;
    c.len=len;
    for(int i=1;i<=len;++i)c.v[i]=a.v[i]+b.v[i];
    for(int i=1;i<=len;++i)
    {
        if(c.v[i]>=10)
        {
            ++c.v[i+1];
            c.v[i]-=10;
        }
    }
    while(c.len&&!c.v[c.len])c.len--;
    return c;
}
gj operator -(gj a,gj b)
{
    if(!a.zheng&&!b.zheng)
    {
        a.zheng=b.zheng=1;
        return b-a;
    }
    if(!a.zheng&&b.zheng)
    {
        a.zheng=1;
        gj c=a+b;
        c.zheng=0;
        return c;
    }
    if(a.zheng&&!b.zheng)
    {
        b.zheng=1;
        gj c=a+b;
        return c;
    }
    if(a.zheng&&b.zheng&&a<b)
    {
        gj c=b-a;
        c.zheng=0;
        return c;
    }
    int len=max(a.len,b.len);
    gj c;
    for(int i=1;i<=len;++i)c.v[i]=a.v[i]-b.v[i];
    c.len=len;
    for(int i=1;i<=c.len;++i)
    {
        if(c.v[i]<0)
        {
            c.v[i+1]--;
            c.v[i]+=10;
        }
    }
    while(c.len&&!c.v[c.len])c.len--;
    return c;
}
gj operator *(gj a,gj b)
{
    gj c;
    for(int i=1;i<=a.len;++i)
    for(int j=1;j<=b.len;++j)
    c.v[i+j-1]+=a.v[i]*b.v[j];
    c.len=a.len+b.len;
    for(int i=1;i<=c.len-1;++i)
    {
        if(c.v[i]>=10)
        {
            c.v[i+1]+=c.v[i]/10;
            c.v[i]%=10;
        }
    }
    while(c.v[c.len]==0&&c.len>1)--c.len;
    if(a.zheng!=b.zheng)c.zheng=0;
    else c.zheng=1;
    return c;
}
gj operator /(gj a,long long b)
{
    gj c;int d=0;
    for(int i=a.len;i>=1;--i)
    c.v[++c.len]=((d*10+a.v[i])/b),d=(d*10+a.v[i])%b;
    for(int i=1;i<=c.len/2;++i)swap(c.v[i],c.v[c.len-i+1]);
    if(!a.len||!b||(a.zheng&&b>0)||(!a.zheng&&b<0))c.zheng=1;
    else c.zheng=0;
    while(c.v[c.len]==0&&c.len>1)--c.len;
    return c;
}
istream& operator >> (istream &in,gj &a)//方便使用cin
{
    char lin[5010];int len;
    scanf("%s",lin+1);
    len=a.len=strlen(lin+1);
    if(lin[1]=='-')a.zheng=0,a.len--;
    else a.zheng=1;
    for(int i=1;i<=a.len;++i)a.v[i]=lin[len-i+1]-'0';
    return in;
}
ostream& operator << (ostream &out,const gj &a)//方便使用cout 
{
    if(!a.len)//一定要注意答案是0得情况 
    {
        cout<<"0";
        return out;
    }
    if(!a.zheng)cout<<"-";
    for(int i=a.len;i>=1;i--)printf("%d",a.v[i]);
    return out;
}
/*------以上为重载部分------*/ 
int main()
{
    cin>>n>>b;
    cout<<n/b;
    return 0;
}