Submission #1026853

#	Time	Username	Problem	Language	Result	Execution time	Memory
1026853		peyman_sf	Mobile (BOI12_mobile)	C++17	0 / 100	961 ms	21432 KiB

mobile

#include <iostream>
#include <fstream>
#include <iomanip>
#include <stack>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <deque>
#include <queue>


#define FastIO ios_base::sync_with_stdio(false); cin.tie(NULL);
#define fileTesting ifstream fileIn("input.txt"); cin.rdbuf(fileIn.rdbuf()); ofstream fileOut("output.txt"); cout.rdbuf(fileOut.rdbuf());
#define endl '\n'
#define print(x) for (auto i : x) cout << i << ' '; cout << endl
#define nloop(a, n) for (ll i = a; i < n; i++)
#define debug(x) cerr << #x << " is " << x << endl
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define ff first
#define ss second

using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<ll> vll;
typedef vector<ld> vld;
typedef pair<int, int> pii;
typedef pair<ld, ld> pld;

const ll maxN = 1e9;
const ll mod = 1e9 + 7;

ll gcd(ll a, ll b) { if (b == 0) return a; return gcd(b, a % b);}
ll lcm(ll a, ll b) { return (a * b) / gcd(a, b); }

ll n, len;
vector<pii> points;

ld check(ld r) {
    ld cl = 0, cr = 0;
    for (auto &p : points)
    {
        ld d = sqrt(pow(r, 2) - pow(p.second, 2));
        if (p.first - d > cr)
            return 0;

        else {
            cl = min(cl, p.first - d);
            cr = max(cr, p.first + d);
        }
    }

    if (cl <= 0 && cr >= len)
        return 1;

    return 0;
}

void solution() {
    cin >> n >> len;

    for (ll i = 0; i < n; i++) {
        ll x, y;
        cin >> x >> y;
        points.push_back(make_pair(x, y));
    }

    ld l = 0, r = len + 1, m;
    for (ll i = 0; i < 60; i++) {
        m = (l + r) / 2;
        if (check(m))
            r = m;
        
        else
            l = m;
    }

    cout << fixed << setprecision(6) << r << endl;
}

int main() {
    FastIO
    ll t = 1;
    // cin >> t;
    while (t--) {
        solution();
    }
    return 0;
}

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