Submission #1148844

#	Time	Username	Problem	Language	Result	Execution time	Memory
1148844		LilPluton	Balloons (CEOI11_bal)	C++20	0 / 100	146 ms	9080 KiB

bal

#include <bits/stdc++.h>
using namespace std;
#define ld long double 
#define ll long long
#define eb emplace_back
const int inf = 1e9;

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    auto check = [&](int x1, ld y1, int x2, ld y2) -> bool {
        ld dist = sqrtl((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
        return dist <= (y1 + y2) && dist >= abs(y1 - y2);
    };

    ld eps = 1e-3; 
    int n;
    cin >> n;
    vector<int> x(n);
    vector<ld> rr(n), ans(n);
    
    for(int i = 0; i < n; ++i){
        cin >> x[i] >> rr[i];
        if(i == 0){
            ans[i] = rr[i];  
        } else {
            ld l = 0.0, r = rr[i], bs = r;
            while(r - l > eps){
                ld mid = (l + r) / 2;
                if(check(x[i - 1], ans[i - 1], x[i], mid)){
                    bs = mid;
                    r = mid; 
                } else {
                    l = mid;
                }
            }
            ans[i] = bs;
        }
    } 

    cout << fixed << setprecision(3);
    for(int i = 0; i < n; ++i){
        cout << ans[i] << '\n';
    }
}

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• Subtask 10: 0 / 10