func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int tmp1 = 0, tmp2 = 0, i, j, n, t, p[2 * 1000001] = {};     cin >> n;     set<int> a;     for (i = 0; i < n; i++) {       cin >> t;       a.insert(t);     }     for (i = 0; i < 2 * 1000001; i++) p[i] = 1000001;     for (int v : a) p[v] = 0;     for (i = 1; i < 2 * 1000001; i++)       if (p[i]) p[i] = p[i - 1] + 1;     for (int v : a)       for (j = 2 * v; j < 2 * 1000001; j += v)         tmp1 = max(tmp1,                    (j - 1 - p[j - 1] < v) ? 0 : (v - ((p[j - 1] + 1) % v)) % v);     cout << tmp1;   }   