제출 #895418

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
895418		MilosMilutinovic	원 고르기 (APIO18_circle_selection)	C++14	37 / 100	3081 ms	591868 KiB

circle_selection

#include <bits/stdc++.h>

using namespace std;

const int N = 4e6;

int root, ls[N], rs[N], tsz;
set<pair<long long, int>> st[N];
vector<int> qv;

void Insert(int& x, int l, int r, int i, pair<long long, int> v) {
  if (!x) {
    x = ++tsz;
  }
  st[x].insert(v);
  if (l == r) {
    return;
  }
  int mid = l + r >> 1;
  if (i <= mid) {
    Insert(ls[x], l, mid, i, v);
  } else {
    Insert(rs[x], mid + 1, r, i, v);
  }
}

void Delete(int& x, int l, int r, int i, pair<long long, int> v) {
  if (!x) {
    x = ++tsz;
  }
  st[x].erase(v);
  if (l == r) {
    return;
  }
  int mid = l + r >> 1;
  if (i <= mid) {
    Delete(ls[x], l, mid, i, v);
  } else {
    Delete(rs[x], mid + 1, r, i, v);
  }
}

void Query(int& x, int l, int r, int ll, int rr, long long L, long long R) {
  if (!x) {
    x = ++tsz;
  }
  if (ll <= l && r <= rr) {
    auto it = st[x].lower_bound({L, -1});
    while (it != st[x].end() && it->first <= R) {
      qv.push_back(it->second);
      it = next(it);
    }
    return;
  }
  int mid = l + r >> 1;
  if (rr <= mid) {
    Query(ls[x], l, mid, ll, rr, L, R);
  } else if (ll > mid) {
    Query(rs[x], mid + 1, r, ll, rr, L, R);
  } else {
    Query(ls[x], l, mid, ll, rr, L, R);
    Query(rs[x], mid + 1, r, ll, rr, L, R);
  }
}

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;
    }
  });
  vector<long long> xs;
  for (int i = 0; i < n; i++) {
    xs.push_back(x[i] - 2 * r[i]);
    xs.push_back(x[i]);
    xs.push_back(x[i] + 2 * r[i]);
  }
  sort(xs.begin(), xs.end());
  xs.erase(unique(xs.begin(), xs.end()), xs.end());
  int k = (int) xs.size();
  vector<int> res(n);
  for (int i = 0; i < n; i++) {
    res[i] = i;
    int p = (int) (lower_bound(xs.begin(), xs.end(), x[i]) - xs.begin());
    Insert(root, 0, k - 1, p, make_pair(y[i], i));
  }
  for (int i : order) {
    if (res[i] != i) {
      continue;
    }
    qv.clear();
    int p = (int) (lower_bound(xs.begin(), xs.end(), x[i]) - xs.begin());
    Delete(root, 0, k - 1, p, make_pair(y[i], i));
    int L = (int) (lower_bound(xs.begin(), xs.end(), x[i] - 2 * r[i]) - xs.begin());
    int R = (int) (lower_bound(xs.begin(), xs.end(), x[i] + 2 * r[i]) - xs.begin());
    Query(root, 0, k - 1, L, R, y[i] - 2 * r[i], y[i] + 2 * r[i]);
    for (int j : qv) {
      if ((x[i] - x[j]) * 1LL * (x[i] - x[j]) + (y[i] - y[j]) * 1LL * (y[i] - y[j]) <= (r[i] + r[j]) * 1LL * (r[i] + r[j])) {
        res[j] = i;
        Delete(root, 0, k - 1, (int) (lower_bound(xs.begin(), xs.end(), x[j]) - xs.begin()), make_pair(y[j], j));
      }
    }
  }
  for (int i = 0; i < n; i++) {
    cout << res[i] + 1 << " ";
  }
  return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

circle_selection.cpp: In function 'void Insert(int&, int, int, int, std::pair<long long int, int>)':
circle_selection.cpp:19:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   19 |   int mid = l + r >> 1;
      |             ~~^~~
circle_selection.cpp: In function 'void Delete(int&, int, int, int, std::pair<long long int, int>)':
circle_selection.cpp:35:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   35 |   int mid = l + r >> 1;
      |             ~~^~~
circle_selection.cpp: In function 'void Query(int&, int, int, int, int, long long int, long long int)':
circle_selection.cpp:55:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |   int mid = l + r >> 1;
      |             ~~^~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 30 / 30
• Subtask 6: 0 / 13