Submission #651924

#	Time	Username	Problem	Language	Result	Execution time	Memory
651924		womogenes	Balloons (CEOI11_bal)	C++14	100 / 100	359 ms	10128 KiB

bal

// https://oj.uz/problem/view/CEOI11_bal
// Balloons

#include <bits/stdc++.h>
#define x first
#define r second
using namespace std;

int main() {
  int n;
  cin >> n;
  vector<pair<double, double>> balls(n);
  for (int i = 0; i < n; i++) {
    cin >> balls[i].x >> balls[i].r;
  }

  // Stack algorithm
  stack<pair<int, double>> st;
  vector<double> radii(n);

  for (int i = 0; i < n; i++) {
    double max_rad = balls[i].r;

    while (!st.empty()) {
      pair<int, double> top = st.top();
      max_rad = min(pow(balls[i].x - top.x, 2) / (4 * top.r), max_rad);
      if (max_rad >= top.r) {
        st.pop();
      } else {
        break;
      }
    }

    st.push(make_pair(balls[i].x, max_rad));
    radii[i] = max_rad;
  }

  cout << fixed << setprecision(3);
  for (double r : radii) {
    cout << r << "\n";
  }

  return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10