Language: C++

#include <iostream>
#include <vector>
#include <string>
using namespace std;

struct foo{
        int num;
        char str;
};

int main(void){

    cin.tie(0);
    ios::sync_with_stdio(false);

    int n,q;

    cin >> n >> q;

    vector<foo> vec(n);
    //vector<char> s(n);
    vector<char> s{istream_iterator<char>(cin), istream_iterator<char>()};
    
    //cin >> s;

    for(int i = 0;i<n;i++){
        vec.push_back((foo){1,s[i]});
    }

    char tmp,tmpp;

    for(int i =0;i<q;i++){ //命令の回数Q回だけぶんまわす
        cin >> tmp >> tmpp;
        for(int l=0;l<n;l++){//l体目のゴーレムの位置を操作
            if(vec[l].str == tmp){//l個目の要素の床が命令対象の床かどうか？
                if(tmpp == 'L'){//L
                    vec[i].num--;
                    if(l != 0){//一番左じゃなかったら実行
                        vec[i-1].num++;
                    }
                }else{//R
                    vec[i].num--;
                    if(l != n-1){//一番右じゃなかったら実行
                        vec[i+1].num++;
                    }
                }
            }
        }
    }

    int ans = 0;

    for(int i = 0;i<n;i++){
       if(vec[i].num > 0){
           ans += vec[i].num;
       }
    }

    cout << ans;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:20: error: 'istream_iterator' was not declared in this scope
   22 |     vector<char> s{istream_iterator<char>(cin), istream_iterator<char>()};
      |                    ^~~~~~~~~~~~~~~~
a.cc:3:1: note: 'std::istream_iterator' is defined in header '<iterator>'; this is probably fixable by adding '#include <iterator>'
    2 | #include <vector>
  +++ |+#include <iterator>
    3 | #include <string>
a.cc:22:37: error: expected primary-expression before 'char'
   22 |     vector<char> s{istream_iterator<char>(cin), istream_iterator<char>()};
      |                                     ^~~~
a.cc:22:37: error: expected '}' before 'char'
   22 |     vector<char> s{istream_iterator<char>(cin), istream_iterator<char>()};
      |                   ~                 ^~~~
a.cc:22:37: error: no matching function for call to 'std::vector<char>::vector(<brace-enclosed initializer list>)'
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_vector.h:707:9: note: candidate: 'template<class _InputIterator, class> std::vector<_Tp, _Alloc>::vector(_InputIterator, _InputIterator, const allocator_type&) [with <template-parameter-2-2> = _InputIterator; _Tp = char; _Alloc = std::allocator<char>]'
  707 |         vector(_InputIterator __first, _InputIterator __last,
      |         ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:707:9: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_vector.h:678:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>]'
  678 |       vector(initializer_list<value_type> __l,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:678:7: note:   conversion of argument 1 would be ill-formed:
/usr/include/c++/14/bits/stl_vector.h:659:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, std::__type_identity_t<_Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>; std::__type_identity_t<_Alloc> = std::allocator<char>]'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:659:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_vector.h:640:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::false_type) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>; std::false_type = std::false_type]'
  640 |       vector(vector&& __rv, const allocator_type& __m, false_type)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/14/bits/stl_vector.h:635:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::true_type) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>; std::true_type = std::true_type]'
  635 |       vector(vector&& __rv, const allocator_type& __m, true_type) noexcept
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:635:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/14/bits/stl_vector.h:624:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&, std::__type_identity_t<_Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>; std::__type_identity_t<_Alloc> = std::allocator<char>]'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:624:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_vector.h:620:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = char; _Alloc = std::allocator<char>]'
  620 |       vector(vector&&) noexcept = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note:   conversion of argument 1 would be ill-formed:
/usr/include/c++/14/bits/stl_vector.h:601:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>]'
  601 |       vector(const vector& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:601:7: note:   conversion of argument 1 would be ill-formed:
/usr/include/c++/14/bits/stl_vector.h:569:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const value_type&, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; size_type = long unsigned int; value_type = char; allocator_type = std::allocator<char>]'
  569 |       vector(size_type __n, const value_type& __value,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:569:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/14/bits/stl_vector.h:556:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; size_type = long unsigned int; allocator_type = std::allocator<char>]'
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:7: note:   conversion of argument 1 would be ill-formed:
/usr/include/c++/14/bits/stl_vector.h:542:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>]'
  542 |       vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note:   conversion of argument 1 would be ill-formed:
/usr/include/c++/14/bits/stl_vector.h:531:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector() [with _Tp = char; _Alloc = std::allocator<char>]'
  531 |       vector() = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:531:7: note:   candidate expects 0 arguments, 1 provided
a.cc:22:37: error: expected ',' or ';' before 'char'
   22 |     vector<char> s{istream_iterator<char>(cin), istream_iterator<char>()};
      |                                     ^~~~
a.cc: At global scope:
a.cc:26:5: error: expected unqualified-id before 'for'
   26 |     for(int i = 0;i<n;i++){
      |     ^~~
a.cc:26:19: error: 'i' does not name a type
   26 |     for(int i = 0;i<n;i++){
      |                   ^
a.cc:26:23: error: 'i' does not name a type
   26 |     for(int i = 0;i<n;i++){
      |                       ^
a.cc:32:5: error: expected unqualified-id before 'for'
   32 |     for(int i =0;i<q;i++){ //命令の回数Q回だけぶんまわす
      |     ^~~
a.cc:32:18: error: 'i' does not name a type
   32 |     for(int i =0;i<q;i++){ //命令の回数Q回だけぶんまわす
      |                  ^
a.cc:32:22: error: 'i' does not name a type
   32 |     for(int i =0;i<q;i++){ //命令の回数Q回だけぶんまわす
      |                      ^
a.cc:53:5: error: expected unqualified-id before 'for'
   53 |     for(int i = 0;i<n;i++){
      |     ^~~
a.cc:53:19: error: 'i' does not name a type
   53 |     for(int i = 0;i<n;i++){
      |                   ^
a.cc:53:23: error: 'i' does not name a type
   53 |     for(int i = 0;i<n;i++){
      |                       ^
a.cc:59:5: error: 'cout' does not name a type
   59 |     cout << ans;
      |     ^~~~
a.cc:60:5: error: expected unqualified-id before 'return'
   60 |     return 0;
      |     ^~~~~~
a.cc:61:1: error: expected declaration before '}' token
   61 | }
      | ^