Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int mod = 1000000007;

int main() {
    string s, t;
    cin >> s >> t;
    int slen = s.length(), tlen = t.length();
    vector<set<char>> se(slen);
    for(int i = slen - 1; i >= 0; --i) {
        se[i].insert(s[i]);
        if(i > 0)
            se[i - 1] = se[i];
    }
    ll ans = 0;
    for(int i = 0; i < tlen; ++i) {
        if(se[0].find(t[i]) == se[0].end()) {
            ans = -1;
            break;
        }
        auto itr = se[i % slen].find(t[i]);
        if(itr != se[i % slen].end())
            ans += i % slen + distance(se[i] % slen].begin(), itr);
        else
            ans += slen - ans % slen;
    }
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:46: error: no match for 'operator%' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<std::set<char> >, std::set<char> >::value_type' {aka 'std::set<char>'} and 'int')
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166,
                 from a.cc:1:
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:24:48: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::set<char> >, std::set<char> >::value_type' {aka 'std::set<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
      |                                                ^~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:24:48: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::set<char> >, std::set<char> >::value_type' {aka 'std::set<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
      |                                                ^~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:24:48: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
      |                                                ^~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:24:48: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::set<char> >, std::set<char> >::value_type' {aka 'std::set<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
      |                                                ^~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__modulus, typename _Dom1::value_type>::result_type> std::operator%(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  409 |     _DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:409:5: note:   template argument deduction/substitution failed:
a.cc:24:48: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
      |                                                ^~~~
/usr/include/c++/14/valarray:1200:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__modulus, _Tp>::result_type> std::operator%(const valarray<_Tp>&, const valarray<_Tp>&)'
 1200 | _DEFINE_BINARY_OPERATOR(%, __modulus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1200:1: note:   template argument deduction/substitution failed:
a.cc:24:48: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::set<char> >, std::set<char> >::value_type' {aka 'std::set<char>'} is not derived from 'const std::valarray<_Tp>'
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
      |                                                ^~~~
/usr/include/c++/14/valarray:1200:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__modulus, _Tp>::result_type> std::operator%(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1200 | _DEFINE_BINARY_OPERATOR(%, __modulus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1200:1: note:   template argument deduction/substitution failed:
a.cc:24:48: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::set<char> >, std::set<char> >::value_type' {aka 'std::set<char>'} is not derived from 'const std::valarray<_Tp>'
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
      |                                                ^~~~
/usr/include/c++/14/valarray:1200:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__modulus, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__modulus, _Tp>::result_type> std::operator%(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1200 | _DEFINE_BINARY_OPERATOR(%, __modulus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1200:1: note:   template argument deduction/substitution failed:
a.cc:24:48: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
   24 |             ans += i % slen + distance(se[i] % slen].begin(), itr);
      |                                                ^~~~