func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<int> a, k;   int fun(int x) {     int c = 0;     for (auto y : a)       if (y <= x) c++;     for (auto y : k) {       if (y > 0 && y <= x) c++;       if (y < 0 && -y <= c) c--;     }     return c;   }   int main() {     ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);     srand(time(NULL));     ;     int T = 1;     cin >> T;     while (T--) {       int n;       cin >> n;       cout << setprecision(10) << 1 / (2 * sin(3.141592653589793238 / (4 * n)));       cout <<   n ;     }     return 0;   }   