func_code_string: #include <bits/stdc++.h>   using namespace std;   const int OO = 1e8 + 10;   const int MOD = 1e9 + 7;   const int MAX = 2e5 + 1;   const double EPS = (1e-9);   map<int, bool> mp;   int main() {     int n, x, y, l, last, ans;     bool f1 = 0, f2 = 0, f3 = 0;     cin >> n >> l >> x >> y;     for (int i = 0; i < n; i++) {       int a;       cin >> a;       mp[a] = 1;     }     for (auto it = mp.begin(); it != mp.end(); it++) {       if (mp.count(it->first + (x - y)) && it->first + x <= l)         f3 = 1, ans = it->first + x;       if (mp.count(it->first - (x - y)) && it->first - x >= 0)         f3 = 1, ans = it->first - x;       if (mp.count(it->first + x + y)) f3 = 1, ans = it->first + x;       if (mp.count(it->first + x)) f1 = 1;       if (mp.count(it->first + y)) f2 = 1;     }     if (f1 && f2) return cout <<  0 n , 0;     if (f3) return cout <<  1 n  << ans <<   n , 0;     if (f1) return cout <<  1 n  << y <<   n , 0;     if (f2) return cout <<  1 n  << x <<   n , 0;     return cout <<  2 n  << x <<     << y <<   n , 0;   }   