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class Solution {
public:
    int mirrorDistance(int n) {
        // Convert number to string
        string str = to_string(n);
 
        // Reverse the string
        reverse(str.begin(), str.end());
 
        // Convert reversed string back to number
        long long rev = stoll(str);
 
        // Return absolute difference
        return abs(n - rev);
    }
};

prog.cpp: In member function ‘int Solution::mirrorDistance(int)’:
prog.cpp:5:9: error: ‘string’ was not declared in this scope
         string str = to_string(n);
         ^~~~~~
prog.cpp:5:9: note: suggested alternative: ‘struct’
         string str = to_string(n);
         ^~~~~~
         struct
prog.cpp:8:17: error: ‘str’ was not declared in this scope
         reverse(str.begin(), str.end());
                 ^~~
prog.cpp:8:17: note: suggested alternative: ‘std’
         reverse(str.begin(), str.end());
                 ^~~
                 std
prog.cpp:8:9: error: ‘reverse’ was not declared in this scope
         reverse(str.begin(), str.end());
         ^~~~~~~
prog.cpp:11:25: error: ‘stoll’ was not declared in this scope
         long long rev = stoll(str);
                         ^~~~~
prog.cpp:14:16: error: ‘abs’ was not declared in this scope
         return abs(n - rev);
                ^~~

Standard output is empty