제출 #945455

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
945455		nolqf	Balloons (CEOI11_bal)	C++14	10 / 100	152 ms	8408 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;
  ld aux;

  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] >= (aux = get(i, stk.back())) ) {
	  r[i] = aux;
	  stk.pop_back();
	}
	if ( stk.size() ) {
	  r[i] = min(r[i], get(i, stk.back()));
	}
	stk.push_back(i);
  }

  cout << fixed << setprecision(3);
  for ( int i = 1; i <= n; ++i ) {
	cout << r[i] << "\n";
  }
  return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10