func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     long long n, m;     cin >> n >> m;     string a, b;     cin >> a >> b;     reverse(a.begin(), a.end());     reverse(b.begin(), b.end());     vector<long long> v(n, 0), u(m, 0);     for (long long i = 0; i < n; i++) {       if (a[i] ==  1 ) {         v[i] = 1;       }     }     for (long long i = 0; i < m; i++) {       if (b[i] ==  1 ) {         u[i] = 1;       }     }     for (long long i = m - 2; i >= 0; i--) {       u[i] += u[i + 1];     }     map<long long, long long> mp;     mp[0] = 1;     for (long long i = 1; i < 2 * pow(10, 5) + 4; i++) {       mp[i] = mp[i - 1] * 2 % 998244353;     }     long long ans = 0;     for (long long i = 0; i < min(v.size(), u.size()); i++) {       if (v[i] == 1) {         long long x = (mp[i] % 998244353 * u[i] % 998244353) % 998244353;         ans = (ans + x) % 998244353;       }     }     cout << ans << endl;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     ;     long long test = 1;     while (test--) solve();   }   