Submission #226263

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
226263	2020-04-23 08:59:16	dolphingarlic	Dragon 2 (JOI17_dragon2)	C++14	100 / 100	2563 ms	3092 KiB

dragon2

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#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
struct Point { ll x, y; } A, B;
inline bool ccw(Point X, Point Y, Point Z) { return (X.x - Y.x) * (Z.y - Y.y) <= (X.y - Y.y) * (Z.x - Y.x); }
vector<Point> by_t[30001];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, m, q, x, y;
  cin >> n >> m;
  while (n--) {
    cin >> A.x >> A.y >> q;
    by_t[q].push_back(A);
  }
  cin >> A.x >> A.y >> B.x >> B.y;
  cin >> q;
  while (q--) {
    cin >> x >> y;
    m = 0;
    for (Point i : by_t[x]) for (Point j : by_t[y]) {
      if (ccw(i, A, B)) m += (ccw(i, A, j) && ccw(j, B, i));
      else m += (ccw(j, A, i) && ccw(i, B, j));
    }
    cout << m << '\n';
  }
 
 
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• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 40 / 40