POJ 2653 Pick-up sticks 线段相交

http://poj.org/problem?id=2653

http://acm.hdu.edu.cn/showproblem.php?pid=1147

http://acm.hdu.edu.cn/showproblem.php?pid=1086 

一个模板过三水题 

测自己写的模板 但是因为队列q.size()动态更新了导致挂了一个下午...真是太傻逼

模板写的很明白了...快速判断可要可不要 , 判断线段重合和覆盖的函数也可要可不要...

/********************* Template ************************/
#include <set>
#include <map>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <cstdio>
#include <string>
#include <vector>
#include <cassert>
#include <cstdlib>
#include <cstring>
#include <sstream>
#include <fstream>
#include <numeric>
#include <iomanip>
#include <iostream>
#include <algorithm>
#include <functional>
using namespace std;

#define EPS         1e-8
#define MAXN        (int)1e5+5
#define MOD         (int)1e9+7
#define PI          acos(-1.0)
#define INF         (1<<30)
#define max(a,b)    ((a) > (b) ? (a) : (b))
#define min(a,b)    ((a) < (b) ? (a) : (b))
#define max3(a,b,c) (max(max(a,b),c))
#define min3(a,b,c) (min(min(a,b),c))
#define BUG         cout<<"BUG! "<<endl;
#define L(t)        (t << 1)
#define R(t)        (t << 1 | 1)
#define Mid(a,b)    ((a + b) >> 1)
#define lowbit(a)   (a & -a)
#define FIN         freopen("in.txt","r",stdin)
#pragma comment     (linker,"/STACK:102400000,102400000")

// typedef long long LL;
// typedef unsigned long long ULL;
// typedef __int64 LL;
// typedef unisigned __int64 ULL;
// int gcd(int a,int b){ return b?gcd(b,a%b):a; }
// int lcm(int a,int b){ return a*b/gcd(a,b); }

/*********************   F   ************************/
struct line{
    double sx,sy,ex,ey;
    double k,b,A,B,C;
    int id;
    line(double _sx = 0,double _sy = 0,double _ex = 0,double _ey = 0,int _id = 0){
        sx = _sx; sy = _sy;
        ex = _ex; ey = _ey;
        id = _id;
        k = (_sy - _ey) / (_sx - _ex);
        b = _sy - _sx * k;
        A = (-k);
        B = 1;
        C = (- _sx) * A - _sy;
    }
};
struct point{
    double x,y;
    point(double _x,double _y){
        x = _x; y = _y;
    }
};
bool cross_Judge(line a ,line b){
    double a11 = a.ex - a.sx;
    double a12 = a.ey - a.sy;
    double a21 = b.sx - a.sx;
    double a22 = b.sy - a.sy;
    double a31 = b.ex - a.sx;
    double a32 = b.ey - a.sy;
    if((a11 * a22 - a21 * a12) * (a11 * a32 - a31 * a12) < 0)
        return true;
    return false;
}
bool same(line a , line b){
    if(a.sx == b.sx && a.sy == b.sy && a.ex == b.ex && a.ey == b.ey) return true;
    if(a.sx == b.ex && a.sy == b.ey && a.ex == b.sx && a.ey == b.sy) return true;
    return false;
}
bool cover(line a , line b){
    if(a.k == b.k && a.b == b.b){
        if(a.sx < b.sx && a.sx > b.ex) return true;
        if(a.sx > b.sx && a.sx < b.ex) return true;
        if(a.ex < b.sx && a.ex > b.ex) return true;
        if(a.ex > b.sx && a.ex < b.ex) return true;
        if(b.sx < a.sx && b.sx > a.ex) return true;
        if(b.sx > a.sx && b.sx < a.ex) return true;
        if(b.ex < a.sx && b.ex > a.ex) return true;
        if(b.ex > a.sx && b.ex < a.ex) return true;
    }
    return false;
}
bool cross(line a , line b){
    if(same(a,b)) return true;
    if(cover(a,b)) return true;
    if(min(a.sx,a.ex) > max(b.sx,b.ex)) return false;
    if(min(b.sx,b.ex) > max(a.sx,a.ex)) return false;
    if(min(a.sy,a.ey) > max(b.sy,b.ey)) return false;
    if(min(b.sy,b.ey) > max(a.sy,a.ey)) return false;
    return (cross_Judge(a,b) && cross_Judge(b,a));
}
int v[MAXN];
int main()
{
    //FIN;
    int n ;
    while(cin>>n && n){
        queue<line> q;
        for(int i = 0 ; i < n ; i++){
            double a,b,c,d;
            scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
            line L = line(a,b,c,d,i+1);
            int len = q.size();
            for(int j = 0 ; j < len; j++){
                if(!cross(L,q.front()))
                    q.push(q.front());
                q.pop();
            }
            q.push(L);
        }
        printf("Top sticks: ");
        int cnt = 0;
        while(!q.empty()){
            v[cnt++] = q.front().id;
            q.pop();
        }
        int i ;
        for(i = 0 ; i < cnt-1 ; i++)
            printf("%d, ",v[i]);
        printf("%d.
",v[i]);
    }
    return 0;
}