Submission #589111

#	Time	Username	Problem	Language	Result	Execution time	Memory
589111		jakubd	Mobile (BOI12_mobile)	C++17	70 / 100	1075 ms	35240 KiB

mobile

#include <bits/stdc++.h>

using namespace std;

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

  int n; double l; cin >> n >> l;

  vector<pair<long long, long long>> a;
  for (int i = 0; i < n; i++) {
    long long x, y; cin >> x >> y;
    a.push_back({x, y});
  }

  long double lo = 0, ri = 1e9;
  while (fabs(lo - ri) > 1e-6) {
    long double m = (lo + ri) / 2, cur = 0;
    
    for (int i = 0; i < n; i++) {
      long double d = sqrt(m * m - a[i].second * a[i].second);
      if (a[i].first - d <= cur) cur = max(cur, a[i].first + d);
    }

    if (cur - l >= 1e-9) ri = m;
    else lo = m;
  }

  cout << fixed << setprecision(12) << lo << "\n";

  return 0;
};

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 5 / 5
• Subtask 13: 5 / 5
• Subtask 14: 5 / 5
• Subtask 15: 5 / 5
• Subtask 16: 0 / 5
• Subtask 17: 0 / 5
• Subtask 18: 0 / 5
• Subtask 19: 0 / 5
• Subtask 20: 0 / 5
• Subtask 21: 0 / 5