记录编号	118287	评测结果	AAAAAAAAAAAA
题目名称	[USACO Feb08] 连线游戏	最终得分	100
用户昵称	HouJikan	是否通过	通过
代码语言	C++	运行时间	0.023 s
提交时间	2014-09-05 22:12:11	内存使用	0.31 MiB

#include <iostream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <list>
#include <vector>
#include <ctime>
#include <iterator>
#include <functional>
#define pritnf printf
#define scafn scanf
#define For(i,j,k) for(int i=(j);i<=(k);(i)++)
using namespace std;
typedef long long LL;
typedef unsigned int Uint; 
#define Ldouble double
const int INF=0x7ffffff;
//==============struct declaration==============
struct fractions
{
  int numerator,denominator;//分子、分母 
  fractions(int numerator,int denominator):numerator(numerator),denominator(denominator){}
  int gcd(int a,int b)
  {
    if (a<b) a^=b^=a^=b;
    return a%b==0?b:gcd(b,a%b);
  }
  void reduction()//约分
  {
     if (numerator==0)
     {
       denominator=1;
       return;
     }
     if (denominator==0)
     {
       numerator=1;
       return;
     }
     int gcdn=gcd(abs(denominator),abs(numerator));
     denominator/=gcdn;
     numerator/=gcdn;
     return;
  } 
  bool operator <(const fractions &rhs) const
  {
    if (rhs.denominator==0) return false;//第二个数的分母为0 
    if (denominator==0) return true;//第一个数的分母为0 
    bool symble1,symble2;
    if (numerator>=0)
      symble1=true;//+
    else
      symble1=false;//-
    if (rhs.numerator>=0)
      symble2=true;//+
    else
      symble2=false;//-
    if (symble1!=symble2)
      return symble1<symble2;
    return numerator*rhs.denominator<denominator*rhs.numerator;
  }
};
//==============var declaration=================
const int MAXN=210;
int x[MAXN],y[MAXN];
//==============function declaration============
set <fractions> exist;
//==============main code=======================
int main()
{  
  string FileName="lines";//程序名 
  string FloderName="COGS";//文件夹名 
  freopen((FileName+".in").c_str(),"r",stdin);
  freopen((FileName+".out").c_str(),"w",stdout);
#ifdef DEBUG  
  system(("cp C:\\Users\\Administrator\\Desktop\\"+FloderName+"\\standard.cpp C:\\Users\\Administrator\\Desktop\\"+FloderName+"\\submit.txt").c_str());
  clock_t Start_Time=clock();
#endif      
   int n;
   scanf("%d",&n);
   For(i,1,n)
   {
     scanf("%d%d",&x[i],&y[i]);
     For(j,1,i-1)
     {
       int deltax=x[i]-x[j];
       int deltay=y[i]-y[j];
       if (deltay<0)
       {
         deltay=-deltay;
         deltax=-deltax;
       }
       fractions k(deltay,deltax);
       k.reduction();
       if (!exist.count(k))
         exist.insert(k);
     }
   }
   printf("%d\n",exist.size());
#ifdef DEBUG  
  clock_t End_Time=clock();
  cout<<endl<<endl<<"Time Used: "<<(End_Time-Start_Time)/CLOCKS_PER_SEC<<endl;
#endif    
  return 0;
}
//================fuction code====================