Submission #838863

#	Time	Username	Problem	Language	Result	Execution time	Memory
838863		SnowRaven52	Mobile (BOI12_mobile)	C++17	0 / 100	150 ms	15956 KiB

mobile

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

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, len;
    cin >> n >> len;
    vector<pair<long long, long long>> v(n);
    for (int i = 0; i < n; ++i) {
        int a, b;
        cin >> a >> b;
        v[i] = {a, b};
    }
    double l = 0.0, r = 2e9;
    while (r - l > 1e-3) {
        double radius = (l - r) / 2.0;
        double mx = 0;
        for (int j = 0; j < n; j++) {
            long long x = v[j].first;
            long long y = v[j].second;
            double a = sqrt( radius * radius - y * y);
            if (x - a < mx) {
                mx = max(x + a, mx);
            }
        }
        if (mx >= len) {
            r = radius;
        } else {
            l = radius;
        }
    }
    cout << setprecision(20) << r;
    return 0;
}

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