Submission #895810

#TimeUsernameProblemLanguageResultExecution timeMemory
895810MilosMilutinovicCircle selection (APIO18_circle_selection)C++14
7 / 100
3080 ms24256 KiB
#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<long long> x(n), y(n), r(n);
  for (int i = 0; i < n; i++) {
    cin >> x[i] >> y[i] >> r[i];
  }
  vector<int> order(n);
  iota(order.begin(), order.end(), 0);
  sort(order.begin(), order.end(), [&](int i, int j) {
    if (r[i] != r[j]) {
      return r[i] > r[j];
    } else {
      return i < j;
    }
  });
  auto Good = [&](int i, int j) {
    return (x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]) <= (r[i] + r[j]) * (r[i] + r[j]);
  };
  vector<int> res(n);
  iota(res.begin(), res.end(), 0);
  for (int pw = 30; pw >= 0; pw--) {
    int k = (1 << pw);
    vector<tuple<long long, long long, int>> v;
    for (int i = 0; i < n; i++) {
      if (res[i] != i) {
        continue;
      }
      v.emplace_back(x[i] / k, y[i] / k, i);
    }
    sort(v.begin(), v.end());
    for (int i : order) {
      if (res[i] != i) {
        continue;
      }
      for (int dx = -2; dx <= 2; dx++) {
        int ptr = (int) (lower_bound(v.begin(), v.end(), make_tuple(x[i] / k - dx, y[i] / k - 2, -1)) - v.begin());
        while (ptr < (int) v.size() && get<0>(v[ptr]) == x[i] / k - dx && abs((y[i] / k) - get<1>(v[ptr])) <= 2) {
          if (Good(i, get<2>(v[ptr]))) {
            int idx = get<2>(v[ptr]);
            if (res[idx] == idx && (r[idx] < r[i] || (r[i] == r[idx] && idx > i))) {
              res[idx] = i;
            }
          }
          ptr += 1;
        }
      }
    }
  }
  for (int i = 0; i < n; i++) {
    cout << res[i] + 1 << " ";
  }
  cout << '\n';
  return 0;
}
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