Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    string s;
    cin >> s;
 
    long long k;
    cin >> k;
 
    long long size = s.size();
 
    s = s + ' ';
    vector<int> cnt(size, 0);
 
    bool start=false;
    bool end=false;
 
    long long tmp = -1;
 
    long long sum = 0;
 
    bool flag=true;
    long long cnt_start=1;
    long long cnt_end=0;
 
    if(s.size() == 1){
        sum = k / 2;
        cout << sum << endl;
        return 0;
    }
 
    for(int i=0; i < s.size()-1; i++){
        if(s.at(i) != s.at(i+1)){
            break;
        }
 
        if(i == s.size()-2){
            sum = s.size() / 2 * k;
            cout << sum << endl;
            return 0;
        }
    }
 
    for(int i=1; i < size; i++){
        if(s.at(0) == s.at(i)){
            cnt_start++;
        }
        else{
            break;
        }
    }
 
    for(int i=size-1; i > 0; i--){
        if(s.at(0) == s.at(i)){
            cnt_end++;
        }
        else{
            break;
        }
    }
 
    for(int j=0; j < size-1; j++){
        if(s.at(j) != s.at(j+1)){
            start = false;
        }
        else if(s.at(j) == s.at(j+1) && tmp <= j){
            start = true;
        }
 
 
        for(int i=j; i < s.size(); i++){
            if(s.at(j) == s.at(i) && start == true){
                cnt.at(j)++;
                end = true;
  //            cout << cnt.at(j) << endl;
            }
            else if(s.at(j) != s.at(i)  && end == true){
                start = false;
                end = false;
                tmp = i;
                cnt.at(j) = cnt.at(j) / 2;
            }
        }
    }
 
    for(int c: cnt){
        sum += c;
    }

    if(s.at(0) != s.at(s.size()-1)){
        sum = cnt * k;
        cout << sum << endl;
        return 0;  
    }
    else{
        sum = (cnt * k) - (cnt_start / 2 + cnt_end /2 - (cnt_start+cnt_end) / 2) * (k-1); 
        cout << sum << endl;
        return 0;  
    }

}

Compiler output:
a.cc: In function 'int main()':
a.cc:92:19: error: no match for 'operator*' (operand types are 'std::vector<int>' and 'long long int')
   92 |         sum = cnt * k;
      |               ~~~ ^ ~
      |               |     |
      |               |     long long int
      |               std::vector<int>
In file included from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/usr/include/c++/14/complex:400:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const complex<_Tp>&)'
  400 |     operator*(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:400:5: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   'std::vector<int>' is not derived from 'const std::complex<_Tp>'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/complex:409:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const _Tp&)'
  409 |     operator*(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:409:5: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   'std::vector<int>' is not derived from 'const std::complex<_Tp>'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/complex:418:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const _Tp&, const complex<_Tp>&)'
  418 |     operator*(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:418:5: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   mismatched types 'const std::complex<_Tp>' and 'long long int'
   92 |         sum = cnt * k;
      |                     ^
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   'std::vector<int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   'std::vector<int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'long long int'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   'std::vector<int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'long long int'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/valarray:1198:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const valarray<_Tp>&, const valarray<_Tp>&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   'std::vector<int>' is not derived from 'const std::valarray<_Tp>'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/valarray:1198:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   'std::vector<int>' is not derived from 'const std::valarray<_Tp>'
   92 |         sum = cnt * k;
      |                     ^
/usr/include/c++/14/valarray:1198:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: note:   template argument deduction/substitution failed:
a.cc:92:21: note:   mismatched types 'const std::valarray<_Tp>' and 'long long int'
   92 |         sum = cnt * k;
      |                     ^
a.cc:97:20: error: no match for 'operator*' (operand types are 'std::vector<int>' and 'long long int')
   97 |         sum = (cnt * k) - (cnt_start / 2 + cnt_end /2 - (cnt_start+cnt_end) / 2) * (k-1);
      |                ~~~ ^ ~
      |                |     |
      |                |     long long int
      |                std::vector<int>
/usr/include/c++/14/complex:400:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const complex<_Tp>&)'
  400 |     operator*(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:400:5: note:   template argument deduction/substitution failed:
a.cc:97:22: note:   'std::vector<int>' is not derived from 'const std::complex<_Tp>'
   97 |         sum = (cnt * k) - (cnt_start / 2 + cnt_end /2 - (cnt_start+cnt_end) / 2) * (k-1);
      |                      ^
/usr/include/c++/14/complex:409:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const _Tp&)'
  409 |     operator*(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:409:5: note:   template argument deduction/substitution failed:
a.cc:97:22: note:   'std::vector<int>' is not derived from 'const std::complex<_Tp>'
   97 |         sum = (cnt * k) - (cnt_start / 2 + cnt_end /2 - (cnt_start+cnt_end) / 2) * (k-1);
      |                      ^
/usr/include/c++/14/complex:418:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const _Tp&, const complex<_Tp>&)'
  418 |     operator*(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:418:5: note:   template argument deduction/substitution failed:
a.cc:97:22: note:   mismatched types 'const std::complex<_Tp>' and 'long long int'
   97 |         sum = (cnt * k) - (cnt_start / 2 + cnt_end /2 - (cnt_start+cnt_end) / 2) * (k-1);
      |                      ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/incl