Submission #680258

#	Time	Username	Problem	Language	Result	Execution time	Memory
680258		peijar	Balloons (CEOI11_bal)	C++17	100 / 100	203 ms	12620 KiB

bal

#include <bits/stdc++.h>
#define int long long
using namespace std;

namespace std {
template <typename T> ostream &operator<<(ostream &out, const vector<T> &vec) {
  out << "[";
  for (int i = 0; i < (int)vec.size(); ++i) {
    out << vec[i];
    if (i + 1 < (int)vec.size())
      out << ", ";
  }
  return out << "]";
}
} // namespace std

void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
  cout << ' ' << H;
  dbg_out(T...);
}

#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

double sq(int x) { return x * x; }

signed main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  int N;
  cin >> N;
  vector<int> x(N);
  vector<double> r(N);
  for (int i = 0; i < N; ++i) {
    cin >> x[i] >> r[i];
  }
  stack<pair<int, double>> stk;

  for (int i = 0; i < N; ++i) {
    while (!stk.empty()) {
      auto [X, R] = stk.top();
      r[i] = min(r[i], sq(X - x[i]) / (4 * R));
      if (r[i] > R)
        stk.pop();
      else
        break;
    }
    stk.emplace(x[i], r[i]);
  }

  for (int i = 0; i < N; ++i) {
    cout << setprecision(15) << fixed << r[i] << '\n';
  }
}

• 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