Submission #945457

#	Time	Username	Problem	Language	Result	Execution time	Memory
945457		nolqf	Balloons (CEOI11_bal)	C++14	100 / 100	154 ms	11672 KiB

bal

#include <bits/stdc++.h>

using namespace std;
using ld = long double;

const int DIM = 2e5 + 5;

ld x[DIM], r[DIM];

inline ld get( int i, int j ) {
  return (x[i] - x[j]) * (x[i] - x[j]) / (4.0 * r[j]);
}

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

  cin >> n;
  for ( int i = 1; i <= n; ++i ) {
	cin >> x[i] >> r[i];
  }
  vector<int> stk;
  for ( int i = 1; i <= n; ++i ) {
	while ( stk.size() ) {
	  r[i] = min(r[i], get(i, stk.back()));
      if ( r[i] < r[stk.back()] ) break;
	  stk.pop_back();
	}
	stk.push_back(i);
  }

  cout << fixed << setprecision(3);
  for ( int i = 1; i <= n; ++i ) {
	cout << r[i] << "\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