Language: C++

#include <bits/stdc++.h>
using namespace std;
#define forx(i, a, b) for (int i = (a); i < (b); i++)
#define rep(i, n) for (int i = 0; i < (n); i++)

typedef long long ll;

int main()
{
    string s, t;
    cin >> s >> t;
    int p = s.size();
    int q = t.size();
    vector<string> x();
    rep(i,p-q+1){
        string u = s;
        rep(j,q){
            if(u[i+j]=='?'){
                u[i + j] = t[j];
                continue;
            }
            if(u[i+j]!=t[j])
                break;
            if(j==q-1){
                x.push_back(u);
            }
        }
    }
    for(string z:x){
        rep(i, p) if (z[i] == '?') z[i] = 'a';
    }
    sort(x.begin(),x.end());
    if(x.size()==0)
        cout << "UNRESTORABLE" << endl;
    else
        cout << x[0] << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:21: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   14 |     vector<string> x();
      |                     ^~
a.cc:25:19: error: request for member 'push_back' in 'x', which is of non-class type 'std::vector<std::__cxx11::basic_string<char> >()'
   25 |                 x.push_back(u);
      |                   ^~~~~~~~~
a.cc:29:18: error: no matching function for call to 'begin(std::vector<std::__cxx11::basic_string<char> > (&)())'
   29 |     for(string z:x){
      |                  ^
In file included from /usr/include/c++/14/bits/algorithmfwd.h:39,
                 from /usr/include/c++/14/bits/stl_algo.h:59,
                 from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/initializer_list:88:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::begin(initializer_list<_Tp>)'
   88 |     begin(initializer_list<_Tp> __ils) noexcept
      |     ^~~~~
/usr/include/c++/14/initializer_list:88:5: note:   template argument deduction/substitution failed:
a.cc:29:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'std::vector<std::__cxx11::basic_string<char> > (*)()'
   29 |     for(string z:x){
      |                  ^
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/range_access.h:52:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&)'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:52:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&) [with _Container = std::vector<std::__cxx11::basic_string<char> >()]':
a.cc:29:18:   required from here
   29 |     for(string z:x){
      |                  ^
/usr/include/c++/14/bits/range_access.h:52:50: error: request for member 'begin' in '__cont', which is of non-class type 'std::vector<std::__cxx11::basic_string<char> >()'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |                                           ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&)'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&) [with _Container = std::vector<std::__cxx11::basic_string<char> >()]':
a.cc:29:18:   required from here
   29 |     for(string z:x){
      |                  ^
/usr/include/c++/14/bits/range_access.h:63:56: error: request for member 'begin' in '__cont', which is of non-class type 'std::vector<std::__cxx11::basic_string<char> >()'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |                                                 ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::begin(_Tp (&)[_Nm])'
   95 |     begin(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note:   template argument deduction/substitution failed:
a.cc:29:18: note:   mismatched types '_Tp [_Nm]' and 'std::vector<std::__cxx11::basic_string<char> >()'
   29 |     for(string z:x){
      |                  ^
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/valarray:1227:5: note: candidate: 'template<class _Tp> _Tp* std::begin(valarray<_Tp>&)'
 1227 |     begin(valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1227:5: note:   template argument deduction/substitution failed:
a.cc:29:18: note:   mismatched types 'std::valarray<_Tp>' and 'std::vector<std::__cxx11::basic_string<char> >()'
   29 |     for(string z:x){
      |                  ^
/usr/include/c++/14/valarray:1238:5: note: candidate: 'template<class _Tp> const _Tp* std::begin(const valarray<_Tp>&)'
 1238 |     begin(const valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1238:5: note:   template argument deduction/substitution failed:
a.cc:29:18: note:   mismatched types 'const std::valarray<_Tp>' and 'std::vector<std::__cxx11::basic_string<char> >()'
   29 |     for(string z:x){
      |                  ^
a.cc:29:18: error: no matching function for call to 'end(std::vector<std::__cxx11::basic_string<char> > (&)())'
/usr/include/c++/14/initializer_list:99:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::end(initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
/usr/include/c++/14/initializer_list:99:5: note:   template argument deduction/substitution failed:
a.cc:29:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'std::vector<std::__cxx11::basic_string<char> > (*)()'
   29 |     for(string z:x){
      |                  ^
/usr/include/c++/14/bits/range_access.h:74:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&)'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:74:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&) [with _Container = std::vector<std::__cxx11::basic_string<char> >()]':
a.cc:29:18:   required from here
   29 |     for(string z:x){
      |                  ^
/usr/include/c++/14/bits/range_access.h:74:48: error: request for member 'end' in '__cont', which is of non-class type 'std::vector<std::__cxx11::basic_string<char> >()'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |                                         ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:85:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&)'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:85:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&) [with _Container = std::vector<std::__cxx11::basic_string<char> >()]':
a.cc:29:18:   required from here
   29 |     for(string z:x){
      |                  ^
/usr/include/c++/14/bits/range_access.h:85:54: error: request for member 'end' in '__cont', which is of non-class type 'std::vector<std::__cxx11::basic_string<char> >()'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |                                               ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:106:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])'
  106 |     end(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~
/usr/include/c++/14/bits/range_access.h:106:5: note:   template argument deduction/substitution failed:
a.cc:29:18: note:   mismatched types '_Tp [_Nm]' and 'std::vector<std::__cxx11::basic_string<char> >()'
   29 |     for(string z:x){
      |                  ^
/usr/include/c++/14/valarray:1249:5: note: candidate: 'template<class _Tp> _Tp* std::end(valarray<_Tp>&)'
 1249 |     end(valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1249:5: note:   template argument deduction/substitution failed:
a.cc:29:18: note:   mismatched types 'std::valarray<_Tp>' and 'std::vector<std::__cxx11::basic_string<char> >()'
   29 |     for(string z:x){
      |                  ^
/usr/include/c++/14/valarray:1265:5: note: candidate: 'template<class _Tp> const _Tp* std::end(const valarray<_Tp>&)'
 1265 |     end(const valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1265:5: note:   template argument deduction/substitution failed:
a.cc:29:18: note:   mismatched types 'const std::valarray<_Tp>' and 'std::vector<std::__cxx11::basic_string<char> >()'
   29 |     for(string z:x){
      |                  ^
a.cc:32:12: error: request for member 'begin' in 'x', which is of non-class type 'std::vector<std::__cxx11::basic_string<char> >()'
   32 |     sort(x.begin(),x.end());
      |            ^~~~~
a.cc:32:22: error: request for member 'end' in 'x', which is of non-class type 'std::vector<std::__cxx11::basic_string<char> >()'
   32 |     sort(x.begin(),x.end());
      |                      ^~~
a.cc:33:10: error: request for member 'size' in 'x', which is of non-class type 'std::vector<std::__cxx11::basic_string<char> >()'
   33 |     if(x.size()==0)
      |          ^~~~
a.cc:36:20: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   36 |         cout << x[0] << endl;
      |                    ^