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| #include <iostream>
#include <sstream>
#include <string>
#include <cstring>
using namespace std;
int n;
class Bigint
{
int data[200];
public:
Bigint(): data() { }
Bigint(const std::string& s): data() { operator=(s); }
int operator[](const int i) const { return data[i]; }
int& operator[](const int i) { return data[i]; }
Bigint& operator=(const std::string&);
int Length() const { return data[0]; }
int& Length() { return data[0]; }
};
Bigint& Bigint::operator=(const std::string& str)
{
memset(data, 0, sizeof(data));
int k = str.size()-4;
while (k > -4)
{
++Length();
std::stringstream ss;
if (k <= 0)
{
ss << str.substr(0, 4+k);
ss >> data[Length()];
}
else
{
ss << str.substr(k, 4);
ss >> data[Length()];
}
k -= 4;
}
return *this;
}
Bigint operator+(const Bigint& a, const Bigint& b)
{
Bigint c;
int x = 0;
c.Length() = std::max(a.Length(), b.Length());
for (int i = 1; i <= c.Length(); ++i)
{
x = x/10000+a[i]+b[i];
c[i] = x%10000;
}
if (x >= 10000)
c[++c.Length()] = 1;
return c;
}
Bigint operator+(const Bigint& a, const int b)
{
Bigint c(a);
int x = b+a[1];
for (int i = 1; i <= c.Length(); ++i)
{
c[i] = x%10000;
x = x/10000+a[i+1];
if (!x)
break;
}
return c;
}
Bigint operator-(const Bigint& a, const Bigint& b)
{
Bigint c;
int x = 0;
for (int i = 1; i <= a.Length(); ++i)
{
x = x/10000+a[i]-b[i]+c[i];
if (x < 0)
x += 10000, --c[i+1];
c[i] = x;
}
c.Length() = a.Length();
while (c.Length() && !c[c.Length()]) --c.Length();
return c;
}
Bigint operator*(const Bigint& a, const Bigint& b)
{
Bigint c;
for (int i = 1; i <= a.Length(); ++i)
{
int x = 0;
for (int j = 1; j <= b.Length(); ++j)
{
x = x+a[i]*b[j]+c[i+j-1];
c[i+j-1] = x%10000;
x /= 10000;
}
c[i+b.Length()] = x;
}
c.Length() = a.Length()+b.Length();
while (c.Length() && !c[c.Length()]) --c.Length();
return c;
}
Bigint operator*(const Bigint& a, const int b)
{
Bigint c;
int x = 0;
for (int i = 1; i <= a.Length(); ++i)
{
x += a[i]*b;
c[i] = x%10000;
x /= 10000;
}
c.Length() = a.Length();
while (x)
{
c[++c.Length()] = x%10000;
x /= 10000;
}
return c;
}
Bigint operator/(const Bigint& a, const int b)
{
Bigint c;
int x = 0;
for (int i = a.Length(); i > 0; --i)
{
c[i] = (x*10000+a[i])/b;
x = (x*10000+a[i])%b;
}
c.Length() = a.Length();
while (c.Length() && !c[c.Length()]) --c.Length();
return c;
}
inline bool operator==(const Bigint& a, const Bigint& b)
{
if (a.Length() != b.Length())
return false;
for (int i = 1; i <= a.Length(); ++i)
if (a[i] != b[i])
return false;
return true;
}
inline bool operator>(const Bigint& a, const Bigint& b)
{
if (a.Length() != b.Length())
return a.Length() > b.Length();
for (int i = 1; i <= a.Length(); ++i)
if (a[i] != b[i])
return a[i] > b[i];
return false;
}
inline bool operator<(const Bigint& a, const Bigint& b)
{
if (a.Length() != b.Length())
return a.Length() < b.Length();
for (int i = 1; i <= a.Length(); ++i)
if (a[i] != b[i])
return a[i] < b[i];
return false;
}
void Print(const Bigint& a)
{
cout << a[a.Length()];
for (int i = a.Length()-1; i >= 1; --i)
{
if (a[i] < 10) cout << "000"; else
if (a[i] < 100) cout << "00"; else
if (a[i] < 1000) cout << "0";
cout << a[i];
}
cout << endl;
}
int main()
{
ios::sync_with_stdio(false);
Bigint a("1234567890");
Bigint b("12345678901");
Bigint c("123456789012");
Bigint d("1234567890123");
Print(a);
Print(b);
Print(c);
Print(d);
Print(b+a);
Print(c-b);
Print(d*c);
Print(d/100);
Print(a*768);
Print(a+22);
cout << ((a+b)*c < (d-c)*a) << endl
<< (c*100 == d) << endl
<< (a+d > b+c) << endl;
a = "2";
b = "3";
c = "4";
Print(a+b*c);
Print((a+b)*c);
}
|
