func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, l;     cin >> n >> l;     deque<int> v;     while (n--) {       int m;       cin >> m;       v.push_back(m);     }     sort(v.begin(), v.end());     int a = v[0];     int b = v[v.size() - 1];     v.push_front(a * (-1));     v.push_back(2 * l - b);     int maxi = 0;     for (int i = 1; i < v.size(); i++) {       maxi = max(maxi, v[i] - v[i - 1]);     }     float maxi2 = maxi;     cout << fixed << setprecision(10) << maxi2 / 2;   }   