Submission #134410

#	Time	Username	Problem	Language	Result	Execution time	Memory
134410		Milki	Balloons (CEOI11_bal)	C++14	100 / 100	281 ms	11844 KiB

bal

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

#define FOR(i, a, b) for(int i = a; i < b; ++i)
#define REP(i, n) FOR(i, 0, n)
#define _ << " " <<
#define sz(x) ((int) x.size())
#define pb(x) push_back(x)
#define TRACE(x) cerr << #x << " = " << x << endl

typedef long long ll;
typedef long double ld;
typedef pair<ld, ld> point;

const int MAXN = 2e5 + 5;
const ld eps = 1e-12;

int n;
ld x[MAXN], r[MAXN];
stack <point> stek;

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

  cin >> n;
  REP(i, n){
    cin >> x[i] >> r[i];
    ld radijus = r[i];

    while(sz(stek)){
      ld xx = stek.top().first - x[i];
      xx *= xx;
      radijus = min(radijus, ( xx ) / ((ld)4 * stek.top().second));

      if(radijus > stek.top().second - eps)
        stek.pop();
      else{
        cout << setprecision(3) << fixed << radijus << "\n";
        stek.push(point(x[i], radijus));
        break;
      }
    }
    if(!sz(stek)){
      cout << setprecision(3) << fixed << radijus << "\n";
      stek.push(point(x[i], radijus));
    }
  }
}

• 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