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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <math.h>
  5. #include <limits.h>
  6. #include <stack>
  7. #include <queue>
  8. #include <map>
  9. #include <set>
  10. #include <algorithm>
  11. #include <string>
  12. #include <functional>
  13. #include <vector>
  14. #include <numeric>
  15. #include <deque>
  16. #include <utility>
  17. #include <bitset>
  18. #include <iostream>
  19. using namespace std;
  20. typedef long long lint;
  21. typedef long double llf;
  22. typedef pair<double, double> pi;
  23.  
  24. struct line{
  25.     double a, b, c;
  26. };
  27.  
  28. pi cross(line p, line q){
  29.     double base = p.a * q.b - p.b * q.a;
  30.     if(fabs(base) < 1e-5) return pi(1e9, 1e9);
  31.     return pi((p.b * q.c - q.b * p.c) / base, (p.c * q.a - q.c * p.a) / base);
  32. }
  33.  
  34. double func(line a, pi b){
  35.     return a.a * b.first + a.b * b.second + a.c;
  36. }
  37.  
  38. void half_plane_intersect(vector<line> &v, vector<pi> &ret){
  39. 	int n = v.size();
  40.     for(int i=0; i<n; i++){
  41.         for(int j=i+1; j<n; j++){
  42.             pi crs = cross(v[i], v[j]);
  43.             if(fabs(crs.first - 1e9) < 1e-4) continue;
  44.             bool bad = 0;
  45.             for(int k=0; k<n; k++){
  46.                 if(func(v[k], crs) < -1e-4){
  47.                     bad = 1;
  48.                     break;
  49.                 }
  50.             }
  51.             if(!bad) ret.push_back(crs);
  52.         }
  53.     }
  54.  
  55. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
/usr/lib/gcc/i586-linux-gnu/5/../../../i386-linux-gnu/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/8t36e9
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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