Submission #991240

#	Time	Username	Problem	Language	Result	Execution time	Memory
991240		BF001	Balloons (CEOI11_bal)	C++17	100 / 100	126 ms	7052 KiB

bal

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

#define N 200005
#define fi first
#define se second

typedef pair<double, double> ii;

double res[N];
int n;

double cal(ii a, double bx){
	return (bx - a.fi) * (bx - a.fi) / (4 * a.se);
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    
   	stack<ii> st;
   	cin >> n;
   	for (int i = 1; i <= n; i++){
   		double r, x;
   		cin >> x >> r;
   		double mi = r;
   		while (!st.empty()){
   			ii tmp = st.top();
   			mi = min(mi, cal(tmp, x));
   			if (mi >= tmp.se) st.pop();
   			else break;
   		}
   		st.push({x, mi});
   		res[i] = mi;
   	}   

   	cout << fixed << setprecision(3) ;

   	for (int i = 1; i <= n; i++){
   		cout << res[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