제출 #906656

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
906656		KhanhMa	Balloons (CEOI11_bal)	C++14	0 / 100	161 ms	1872 KiB

bal

#include <bits/stdc++.h>
#define forr(_a,_b,_c) for(_a = _b; _a <= _c; ++_a)
#define ford(_a,_b,_c) for(_a = (_b) + 1; _a --> _c;)
#define forf(_a,_b,_c) for(_a = _b; _a < _c; ++_a)
#define ll long long
#define ull unsigned long long
#define pb push_back
using namespace std;

const int nmax = 2e5 + 5;
const ll mod = 1e9 + 7;

int i;

struct balloons{
    double x, r;
};

double radius(balloons left, balloons right){
    return (right.x - left.x)*(right.x - left.x)/(4*left.r);
}


int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    //freopen("main.inp", "r", stdin);
    //freopen("main.out", "w", stdout);
    int n; cin >> n;
    stack<balloons> s;
    forr(i,1,n){
        balloons a; cin >> a.x >> a.r;
        while(!s.empty() && s.top().r <= a.r) s.pop();
        if(s.empty()){
            cout << fixed << setprecision(3) << a.r <<  "\n";
            s.push(a);
            continue;
        }
        double current = min(radius(s.top(), a), a.r);
        cout << fixed << setprecision(3) << current << "\n";
        a.r = current;
        s.push(a);
    }
    return 0;
}

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