func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 2000200;   bool Ch(int Ans);   int n, k;   int a[N];   int c[N];   int p[N];   int main() {     cin >> n >> k;     for (int i = 1; i <= n; i++) scanf( %d , a + i), c[a[i]]++;     for (int i = 1; i < N; i++) p[i] = c[i] + p[i - 1];     sort(a + 1, a + n + 1);     for (int Ans = a[1]; Ans >= 1; Ans--)       if (Ch(Ans)) return cout << Ans, 0;     assert(0);   }   bool Ch(int Ans) {     if (Ans <= k + 1) return true;     for (int j = Ans + Ans; j <= N; j += Ans)       if (p[j - 1] - p[j - Ans + k]) return false;     return true;   }   