func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     string s;     cin >> s;     map<char, int> mp;     for (char c : s) mp[c]++;     cout << 2 * min(mp[ L ], mp[ R ]) + 2 * min(mp[ U ], mp[ D ]) << endl;   }   