func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, l, t, a[3000010], gx;   double Ans;   signed main() {     scanf( %lld%lld%lld , &n, &l, &t);     t *= 2;     gx = t / l, t %= l;     for (long long i = 1; i <= n; i++) scanf( %lld , &a[i + n]);     for (long long i = 1; i <= n; i++) a[i] = a[i + n] - l;     for (long long i = 1; i <= n; i++) a[i + n + n] = a[i + n] + l;     for (long long i = 1, j1 = 1, j2 = i + 1; i <= n; i++) {       while (a[i + n] - a[j1] > t) j1++;       while (a[j2 + 1] - a[i + n] <= t && j2 + 1 <= 3 * n) j2++;       Ans += 0.25 * ((n - 1) * gx + i + n - j1 + (n - 1) * gx + j2 - i - n);     }     printf( %.6lf n , Ans / 2);   }   