oj.uz

Submission #54998

# Submission time Handle Problem Language Result Execution time Memory
54998 2018-07-05T18:44:50 Z dfistric Printed Circuit Board (CEOI12_circuit) C++14
60 / 100
 100 ms 3580 KB 
#include <bits/stdc++.h>

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define REP(i, n) FOR(i, 0, n)
#define point pair <int, int>
#define X first
#define Y second
#define ll long long

using namespace std;

const int MAXN = 100010;

struct line {
  point A, B;
};

line lines[MAXN];
point ray;
multiset <line> s;
vector <point> ve;
vector <int> out;
int arr[MAXN];
int n;

ll ccw(point a, point b, point c) {
  ll out = ((ll) a.X * (b.Y - c.Y)) +
           ((ll) b.X * (c.Y - a.Y)) +
           ((ll) c.X * (a.Y - b.Y));
  return out;
}

ll ccw0(point a, point b) {
  return ccw({0, 0}, a, b);
}

ll dist(point a) {
  return (a.X * a.X) + (a.Y * a.Y);
}

bool operator==(line x, line y) {
  return x.A == y.A && x.B == y.B;
}

bool operator< (line x, line y) {
  if (x == y) return 0;
  if (ccw0(x.A, x.B) < 0) swap(x.A, x.B);
  if (ccw0(y.A, y.B) < 0) swap(y.A, y.B);

  ll P = ccw(x.B, x.A, y.A) + ccw(x.B, y.A, y.B);

  if (P == 0) {
    if (x.A.Y == y.A.Y) return x.A.X < y.A.X;
    return x.A.Y < y.A.Y;
  }

  return P > 0;
}

bool cmp(int a, int b) {
  if (ccw0(ve[a], ve[b]) == 0) {
    return ve[a] < ve[b];
  }
  return ccw0(ve[a], ve[b]) > 0;
}

int main() {
  ios_base::sync_with_stdio(false);

  cin >> n;
  REP(i, n) {
    int a, b;
    cin >> a >> b;
    ve.push_back({a, b});
    arr[i] = i;
  }

  sort(arr, arr + n, cmp);
  //REP(i, n) cout << arr[i] + 1 << " "; cout << endl;

  REP(ind, n) {
    int i = arr[ind];
    point x = ve[i];
    ray = x;

    for (int t : {-1, 1}) {
      int j = (i + t + n) % n;
      point y = ve[j];
      
      if (cmp(i, j)) {
        line tr = {x, y};
        s.insert(tr);
      }
    }
    
    line tr = *s.begin();
    if (ccw(tr.A, tr.B, x) == 0) out.push_back(i);

    for (int t : {-1, 1}) {
      int j = (i + t + n) % n;
      point y = ve[j];

      if (!cmp(i, j)) {
        line tr = {y, x};
        s.erase(s.find(tr));
      }
    }
  }

  sort(out.begin(), out.end());
  cout << out.size() << "\n";
  for (int x : out) cout << x + 1 << " ";
  cout << "\n";

  return 0;
}

Subtask #1
60.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Incorrect 3 ms 376 KB Output isn't correct
3 Correct 4 ms 428 KB Output is correct
4 Correct 5 ms 556 KB Output is correct
5 Correct 14 ms 736 KB Output is correct
6 Correct 12 ms 736 KB Output is correct
7 Correct 24 ms 988 KB Output is correct
8 Correct 10 ms 988 KB Output is correct
9 Correct 10 ms 1036 KB Output is correct
10 Correct 11 ms 1036 KB Output is correct
11 Correct 13 ms 1036 KB Output is correct
12 Incorrect 16 ms 1112 KB Output isn't correct
13 Correct 41 ms 1388 KB Output is correct
14 Correct 35 ms 1396 KB Output is correct
15 Incorrect 37 ms 1396 KB Output isn't correct
16 Incorrect 84 ms 1980 KB Output isn't correct
17 Execution timed out 138 ms 3048 KB Time limit exceeded
18 Runtime error 30 ms 3432 KB Execution killed with signal 11 (could be triggered by violating memory limits)
19 Runtime error 28 ms 3516 KB Execution killed with signal 11 (could be triggered by violating memory limits)
20 Runtime error 32 ms 3580 KB Execution killed with signal 11 (could be triggered by violating memory limits)