Submission #798422

#	Time	Username	Problem	Language	Result	Execution time	Memory
798422		trMatherz	Mobile (BOI12_mobile)	C++17	0 / 100	596 ms	15956 KiB

mobile

# include <numeric>
# include <vector>
# include <algorithm>
# include <cmath>
# include <array>
# include <bitset>
# include <set>
# include <map>
# include <string>
# include <cstdlib>
# include <queue>
# include <iomanip>

using namespace std;
#define ll long long int
#define all(x) x.begin(), x.end()
#define f x.first
#define s x.second


     # include <iostream>

/*
# include <fstream>
 ifstream cin ("angry.in");
 ofstream cout ("angry.out");
*/

/*

1 3 8 10 11
 2 5 2 1
 
 */



int main(){
    int n, k;
    cin >> n >> k;
    vector<array<ll, 2>> a(n);
    for(int i = 0; i < n; i++){
        cin >> a[i][0] >> a[i][1];
    }
    auto cf = [&](double m){
        double cur = 0;
        for(int i = 0; i < n; i++){
            double d = sqrt(m*m + a[i][1]*a[i][1]);
            double e1 = a[i][0] - d, e2 = a[i][0] + d;
            if(e1 <= cur){cur = max(cur, e2);}
        }
        if(cur >= k){return false;}
        return true;
    };
    double l = 0, r = 1e9;
    while(r - l > 1e-5 ){
        double m = l + (r-l)/2.0;
        if(cf(m)){l = m;}
        else{r = m;}
    }
    cout << l;
    return 0;
}

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