Language: C++

#include <vector>
int main(){
    std::vector<std::string> answer;
    std::string hint,T,x,d,moke;
    std::cin >> hint >> T;
    int w = 0;
    bool lala = true;
    for(int a = 0;a <( hint.size() - T.size()+ 1);a++){
        moke = hint;
        d = hint.substr(a,T.size());
        x = T;
        for(int b = 0;b < T.size();b++){
            if(d[b] == '?'){
                x[b] = '?';
            }
        }
        if(d == x){
            w = a;
            lala = false;
            moke.erase(w,w + T.size());
            moke.insert(w,T);
            for(int f = 0;f < moke.size();f++){
                if(moke[f] == '?'){
                    moke[f] = 'a';
                }
            }
            answer.push_back(moke);
        }
    }
    if(lala){
        std::cout <<"UNRESTORABLE"<<std::endl;
        return 0;
    }
    std::string rrr;
    int count = 0;
    for(std::string hoge:answer){
        if(count == 0){
            rrr = hoge;
        }
        if(count != 0 && hoge > rrr){
            rrr = hoge;
        }
        count++;
    }
    std::cout <<rrr<<std::endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:3:22: error: 'string' is not a member of 'std'
    3 |     std::vector<std::string> answer;
      |                      ^~~~~~
a.cc:2:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
    1 | #include <vector>
  +++ |+#include <string>
    2 | int main(){
a.cc:3:28: error: template argument 1 is invalid
    3 |     std::vector<std::string> answer;
      |                            ^
a.cc:3:28: error: template argument 2 is invalid
a.cc:4:10: error: 'string' is not a member of 'std'
    4 |     std::string hint,T,x,d,moke;
      |          ^~~~~~
a.cc:4:10: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
a.cc:5:10: error: 'cin' is not a member of 'std'
    5 |     std::cin >> hint >> T;
      |          ^~~
a.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    1 | #include <vector>
  +++ |+#include <iostream>
    2 | int main(){
a.cc:5:17: error: 'hint' was not declared in this scope; did you mean 'int'?
    5 |     std::cin >> hint >> T;
      |                 ^~~~
      |                 int
a.cc:5:25: error: 'T' was not declared in this scope
    5 |     std::cin >> hint >> T;
      |                         ^
a.cc:9:9: error: 'moke' was not declared in this scope
    9 |         moke = hint;
      |         ^~~~
a.cc:10:9: error: 'd' was not declared in this scope
   10 |         d = hint.substr(a,T.size());
      |         ^
a.cc:11:9: error: 'x' was not declared in this scope
   11 |         x = T;
      |         ^
a.cc:27:20: error: request for member 'push_back' in 'answer', which is of non-class type 'int'
   27 |             answer.push_back(moke);
      |                    ^~~~~~~~~
a.cc:31:14: error: 'cout' is not a member of 'std'
   31 |         std::cout <<"UNRESTORABLE"<<std::endl;
      |              ^~~~
a.cc:31:14: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:31:42: error: 'endl' is not a member of 'std'
   31 |         std::cout <<"UNRESTORABLE"<<std::endl;
      |                                          ^~~~
a.cc:2:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    1 | #include <vector>
  +++ |+#include <ostream>
    2 | int main(){
a.cc:34:10: error: 'string' is not a member of 'std'
   34 |     std::string rrr;
      |          ^~~~~~
a.cc:34:10: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
a.cc:36:14: error: 'string' is not a member of 'std'
   36 |     for(std::string hoge:answer){
      |              ^~~~~~
a.cc:36:14: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
a.cc:45:10: error: 'cout' is not a member of 'std'
   45 |     std::cout <<rrr<<std::endl;
      |          ^~~~
a.cc:45:10: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:45:17: error: 'rrr' was not declared in this scope
   45 |     std::cout <<rrr<<std::endl;
      |                 ^~~
a.cc:45:27: error: 'endl' is not a member of 'std'
   45 |     std::cout <<rrr<<std::endl;
      |                           ^~~~
a.cc:45:27: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
a.cc:46:5: error: expected primary-expression before 'return'
   46 |     return 0;
      |     ^~~~~~
a.cc:45:32: error: expected ')' before 'return'
   45 |     std::cout <<rrr<<std::endl;
      |                                ^
      |                                )
   46 |     return 0;
      |     ~~~~~~                      
a.cc:36:8: note: to match this '('
   36 |     for(std::string hoge:answer){
      |        ^