Language: C++

#include <bits/stdc++.h>

using namespace std;


int main() {
  int co=0;
  int N;
  string S;
  //入力受付
  cin >> N;
  cin >> S;
  string str="";
  vector<int> n;
  //vector<char> c;
  
  for(int i=0;i<N;i++){
    index=str.find(S[i]);
    if(index== string::npos){
      str +=S[i];
      n.push_back(1);
    }else
      n[index]++;
    }
  }

  co =1;
  for(int i=0;i<n.size();i++){
    if(n[i]>1)n[i]++;
    co = co * n[i];
  }

  cout << (co-1) % 1000000007;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:24: error: overloaded function with no contextual type information
   18 |     index=str.find(S[i]);
      |                        ^
a.cc:19:13: error: invalid operands of types '<unresolved overloaded function type>' and 'const std::__cxx11::basic_string<char>::size_type' {aka 'const long unsigned int'} to binary 'operator=='
   19 |     if(index== string::npos){
      |        ~~~~~^~~~~~~~~~~~~~~
a.cc:23:8: error: no match for 'operator[]' (operand types are 'std::vector<int>' and '<unresolved overloaded function type>')
   23 |       n[index]++;
      |        ^
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:1128:7: note: candidate: 'std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](size_type) [with _Tp = int; _Alloc = std::allocator<int>; reference = int&; size_type = long unsigned int]'
 1128 |       operator[](size_type __n) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:1128:28: note:   no known conversion for argument 1 from '<unresolved overloaded function type>' to 'std::vector<int>::size_type' {aka 'long unsigned int'}
 1128 |       operator[](size_type __n) _GLIBCXX_NOEXCEPT
      |                  ~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:1147:7: note: candidate: 'std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](size_type) const [with _Tp = int; _Alloc = std::allocator<int>; const_reference = const int&; size_type = long unsigned int]'
 1147 |       operator[](size_type __n) const _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:1147:28: note:   no known conversion for argument 1 from '<unresolved overloaded function type>' to 'std::vector<int>::size_type' {aka 'long unsigned int'}
 1147 |       operator[](size_type __n) const _GLIBCXX_NOEXCEPT
      |                  ~~~~~~~~~~^~~
a.cc: At global scope:
a.cc:27:3: error: 'co' does not name a type
   27 |   co =1;
      |   ^~
a.cc:28:3: error: expected unqualified-id before 'for'
   28 |   for(int i=0;i<n.size();i++){
      |   ^~~
a.cc:28:15: error: 'i' does not name a type
   28 |   for(int i=0;i<n.size();i++){
      |               ^
a.cc:28:26: error: 'i' does not name a type
   28 |   for(int i=0;i<n.size();i++){
      |                          ^
a.cc:33:3: error: 'cout' does not name a type
   33 |   cout << (co-1) % 1000000007;
      |   ^~~~
a.cc:35:1: error: expected declaration before '}' token
   35 | }
      | ^