#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pi pair<int,int>
#define vi vector<int>
#define rep(i,x,n) for(int i=x; i<n; ++i)
#define For(i,n) rep(i,0,n)
#define pb push_back
#define endl "\n"
#define sp ' '
#define f first
#define s second
#define sz size()
#define all(x) (x).begin(),(x).end()
const int N = 3e5+10, OO = 1e18, mod = 1e9+7;
void tr(int a, int b){cout << a << sp << b << endl;}
void cmx(int &a, int b){a = max(a,b);}
void cmn(int &a, int b){a = min(a,b);}
double eps = 1e-9;
vector <pi> v;
int n,L;
bool ok(double m){
double mn = 2e9, mx = -2e9, z = 0;
For(i,n){
auto [x,y] = v[i];
if(y*y > m*m) continue;
double d = sqrt(m * m - y * y);
if(x-d <= z && z <= x+d){
z = x+d;
}
if(x-d < mn) mn = x-d;
if(mx < x+d) mx = x+d;
}
if(z >= L){
assert(abs(z-mx) < 1);
}
return (mn <= 0 && L <= mx && z >= mx);
}
int32_t main() {
ios::sync_with_stdio(0); cin.tie(0);
cin >> n >> L;
For(i,n){
int x,y; cin >> x >> y;
v.pb({x,y});1 `
}
double l = 0, r = 1e10;
For(i,60){
double m = (l+r)/2;
if(ok(m)) r = m;
else l = m;
}
cout << setprecision(10) << r << endl;
return 0;
}
Compilation message
mobile.cpp:46:25: error: stray '`' in program
46 | v.pb({x,y});1 `
| ^
mobile.cpp: In function 'int32_t main()':
mobile.cpp:46:22: error: expected ';' before '}' token
46 | v.pb({x,y});1 `
| ^
| ;
47 | }
| ~
mobile.cpp:46:21: warning: statement has no effect [-Wunused-value]
46 | v.pb({x,y});1 `
| ^
