func_code_string: #include <bits/stdc++.h>   using namespace std;   constexpr int MOD = 998244353;   int main() {     int R, C;     cin >> R >> C;     int X = 1;     while (R--) X = (2 * X) % MOD;     while (C--) X = (2 * X) % MOD;     cout << X << endl;   }   