问答 源码：

#import "bits/stdc++.h"
#define ll long long
#define endl '\n'
#define max(x, y) (x > y ? x : y)
#define min(x, y) (x < y ? x : y)
#define pii pair<int, int>
#define piii pair<int, pii>
#define pdd pair<double, double>

using namespace std;
const int N = 1e5 + 1;
ll n, d;
double ttx, tty;
pdd a[N], c[N];

bool cmp(pdd tx, pdd ty) { return tx.second < ty.second; }

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> d;
    for(int i = 1; i<=n; i++) { cin >> a[i].first >> a[i].second; }

    for(int i = 1; i <= n; i ++) {
        int x = a[i].first, y = a[i].second;
        int w = 4 * x * x + 4 * (d * d - x * x - y * y);
        if(w >= 0) {
            c[i].first = x - (sqrt(w))/2;
            c[i].second = x + (sqrt(w))/2;
        } else { goto Loop; }
    }

    sort(c + 1, c + n + 1, cmp);

    double where=c[1].second;
    int Answer = 1;

    for(int i = 1; i <= n; i ++) {
        if(c[i].first > where) {
            Answer ++;
            where = c[i].second;
        }
    }

    cout << Answer << endl;

    return 0;

Loop:
    cout << -1 << endl;

    return 0;
}

a.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated]
    1 | #import "bits/stdc++.h"
      |  ^~~~~~
a.cpp: In function 'int main()':
a.cpp:50:1: error: jump to label 'Loop'
   50 | Loop:
      | ^~~~
a.cpp:31:17: note:   from here
   31 |   } else { goto Loop; }
      |                 ^~~~
a.cpp:37:6: note:   crosses initialization of 'int Answer'
   37 |  int Answer = 1;
      |      ^~~~~~
a.cpp:36:9: note:   crosses initialization of 'double where'
   36 |  double where=c[1].second;
      |         ^~~~~