Submission #853239

#	Time	Username	Problem	Language	Result	Execution time	Memory
853239		Youssif_Elkadi	Balloons (CEOI11_bal)	C++17	100 / 100	408 ms	5592 KiB

bal

#include <bits/stdc++.h>
using namespace std;
const int N = 5e5 + 3, mod = 1e9 + 7, inf = 1e9 + 5;
double dist(double x1, double y1, double x2, double y2)
{
   return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
}
double gimr(double x1, double y1, double x2, double y2)
{
   double l = 0, r = y2, mid, ans = 0;
   for (int i=0;i<100;i++)
   {
      mid = (l + r) / 2;
      if (dist(x1, y1, x2, mid) >= y1 + mid)
         ans = max(ans, mid), l = mid;
      else
         r = mid;
   }
   return ans;
}
int main()
{
   ios_base::sync_with_stdio(0), cin.tie(NULL), cout.tie(NULL);
   int n;
   cin >> n;
   stack<pair<double, double>> st;
   for (int i = 0; i < n; i++)
   {
      double x, r;
      cin >> x >> r;
      while (true)
      {
         if (st.size())
            r = min(r, gimr(st.top().first, st.top().second, x, r));
         else
            break;
         if (r > st.top().second)
            st.pop();
         else
            break;
      }
      cout << fixed << setprecision(3) << r << "\n";
      st.push({x, r});
   }
}

• 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