OJ-Problems-Source/HDOJ/3429_autoAC.cpp

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C++
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#include <cstdio>
#include <cstring>
#include <cctype>
#include <iostream>
#include <string>
using namespace std;
#define i64 __int64
class fraction
{
private:
inline i64 Gcd (i64 x,i64 y)
{
return y==0?x:Gcd(y,x%y);
}
i64 Lcm (i64 x,i64 y)
{
x=x/Gcd(x,y)*y;
if(x<0) x=-x;
return x;
}
public:
i64 a,b;
fraction () {}
fraction (i64 x)
{
a=x; b=1;
}
fraction (i64 x,i64 y)
{
a=x; b=y;
Refresh();
}
void Refresh ()
{
if (b<0) b=-b,a=-a;
i64 k=Gcd(a,b);
if (k<0) k=-k;
a/=k; b/=k;
}
fraction Inverse () const
{
return fraction (b,a);
}
fraction operator + (fraction p)
{
fraction ans;
ans.b=Lcm(b,p.b);
ans.a=ans.b/b*a+ans.b/p.b*p.a;
ans.Refresh();
return ans;
}
fraction operator - (fraction p)
{
fraction ans;
ans.b=Lcm(b,p.b);
ans.a=ans.b/b*a-ans.b/p.b*p.a;
ans.Refresh();
return ans;
}
fraction operator * (fraction p)
{
fraction ans;
ans.a=a*p.a;
ans.b=b*p.b;
ans.Refresh();
return ans;
}
fraction operator / (fraction p)
{
fraction ans;
ans.a=a*p.b;
ans.b=b*p.a;
ans.Refresh();
return ans;
}
bool operator < (const fraction &p) const
{
return a*p.b<b*p.a;
}
bool operator > (const fraction &p) const
{
return a*p.b>b*p.a;
}
bool operator == (const fraction &p) const
{
return a*p.b==b*p.a;
}
fraction operator | (fraction p)
{
fraction t1=fraction (b,a);
fraction t2=p.Inverse ();
t1=t1+t2;
return t1.Inverse();
}
void print ()
{
printf("%I64d/%I64d\n",a,b);
}
};
string s;
int len;
fraction read (int &now)
{
int fz=0,fm=0;
int i;
for (i=now;i<len;i++)
{
if (s[i]=='/') break;
fz*=10;
fz+=s[i]-'0';
}
for (i=i+1;i<len;i++)
{
if (isdigit(s[i]))
{
fm*=10;
fm+=s[i]-'0';
}
else break;
}
fraction tmp(fz,fm);
now=i-1;
return tmp;
}
fraction cal (int &now)
{
fraction ans;
int front=-1;
for (int i=now+1;i<len;i++)
{
if (s[i]=='(')
{
if(front==-1)
ans=cal(i);
else if(front==0)
ans=ans+cal(i);
else if(front==1)
ans=ans|cal(i);
}
else if (isdigit(s[i]))
{
if (front==-1)
ans=read(i);
else if (front==0)
ans=ans+read(i);
else if (front==1)
ans=ans|read(i);
}
else if (s[i]==')')
{
now=i;
return ans;
}
else if (s[i]=='&')
front=0;
else if (s[i]=='|')
front=1;
}
}
int main ()
{
while (getline(cin,s))
{
len=s.length();
fraction ans;
int flag=-1;
for (int i=0;i<len;i++)
{
if (s[i]=='(')
{
if (flag==-1)
ans=cal(i);
else if (flag==0)
ans=ans+cal(i);
else if(flag==1)
ans=ans|cal(i);
}
else if (isdigit(s[i]))
{
if (flag==-1)
ans=read(i);
else if (flag==0)
ans=ans+read(i);
else if (flag==1)
ans=ans|read(i);
}
else if (s[i]=='&')
flag=0;
else if (s[i]=='|')
flag=1;
}
ans.print();
}
return 0;
}