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struct Point {
  int x, y;
  Point operator-(Point p) {
    return {x - p.x, y - p.y};
  }
};
 
int CrossProd(Point p, Point q) {
  return p.x * q.y - p.y * q.x;
}
 
 
 
class TrianglePainting {
  public:
#undef int
  double expectedArea(vector <int> x1, vector <int> y1, vector <int> x2, vector <int> y2, vector <int> Prob) {
#define int long long
    vector<pair<Point, Point>> pts;
    int n = SZ(x1);
    vector<LD> pr(n);
    LD res = 0;
    REP (i, n) {
      pts.PB({{x1[i], y1[i]}, {x2[i], y2[i]}});
      auto& p = pts.back();
      if (CrossProd(p.st, p.nd) < 0) {
        swap(p.st, p.nd);
      }
      pr[i] = Prob[i] * .01;
      res += pr[i] * CrossProd(p.st, p.nd) / 2;
      Point diff = p.st - p.nd;
      REP (j, i) {
        Point old[3] = {pts[j].nd, pts[j].st - pts[j].nd, {-pts[j].st.x, -pts[j].st.y}};
        REP (tr, 3) {
          if (CrossProd(old[tr], p.nd) > 0 && CrossProd(diff, old[tr]) > 0) {
            res += pr[i] * pr[j] * CrossProd(old[tr], p.nd);
          }
          if (CrossProd(old[tr], p.st) > 0 && CrossProd(diff, old[tr]) <= 0) {
            res += pr[i] * pr[j] * CrossProd(old[tr], p.st);
          }
        }
      }
    }
 
 
    return res;
  }
 
};

prog.cpp:17:23: error: 'vector' has not been declared
   double expectedArea(vector <int> x1, vector <int> y1, vector <int> x2, vector <int> y2, vector <int> Prob) {
                       ^
prog.cpp:17:30: error: expected ',' or '...' before '<' token
   double expectedArea(vector <int> x1, vector <int> y1, vector <int> x2, vector <int> y2, vector <int> Prob) {
                              ^
prog.cpp: In member function 'double TrianglePainting::expectedArea(int)':
prog.cpp:19:5: error: 'vector' was not declared in this scope
     vector<pair<Point, Point>> pts;
     ^
prog.cpp:19:12: error: 'pair' was not declared in this scope
     vector<pair<Point, Point>> pts;
            ^
prog.cpp:19:22: error: expected primary-expression before ',' token
     vector<pair<Point, Point>> pts;
                      ^
prog.cpp:19:29: error: expected primary-expression before '>>' token
     vector<pair<Point, Point>> pts;
                             ^
prog.cpp:19:32: error: 'pts' was not declared in this scope
     vector<pair<Point, Point>> pts;
                                ^
prog.cpp:20:16: error: 'x1' was not declared in this scope
     int n = SZ(x1);
                ^
prog.cpp:20:18: error: 'SZ' was not declared in this scope
     int n = SZ(x1);
                  ^
prog.cpp:21:12: error: 'LD' was not declared in this scope
     vector<LD> pr(n);
            ^
prog.cpp:21:20: error: 'pr' was not declared in this scope
     vector<LD> pr(n);
                    ^
prog.cpp:22:8: error: expected ';' before 'res'
     LD res = 0;
        ^
prog.cpp:23:10: error: 'i' was not declared in this scope
     REP (i, n) {
          ^
prog.cpp:23:14: error: 'REP' was not declared in this scope
     REP (i, n) {
              ^
prog.cpp:46:12: error: 'res' was not declared in this scope
     return res;
            ^

Standard output is empty