Language: C++

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

int main(){
    
    string str,str1,str2;
    int q;
    int a, b;
    
    cin >> str;
    cin >> q;
    for ( int i = 0; i < q; q++ ){
        cin >> str1 >> a >> b;
        if ( str1 == "replace" ){
            cin >> sent;
            str.replace(a, b-a, str2);
        }
        if ( str1 == "reverse"){
            for ( int j = 0; j < (b-a); j++){
                str.replace(a+j, a+j, str[b-j]);
            }
        }
        if ( str1 == "print") cout << str.substr(a, b-a) << endl;
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:20: error: 'sent' was not declared in this scope
   16 |             cin >> sent;
      |                    ^~~~
a.cc:21:28: error: no matching function for call to 'std::__cxx11::basic_string<char>::replace(int, int, __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type&)'
   21 |                 str.replace(a+j, a+j, str[b-j]);
      |                 ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:2275:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (near match)
 2275 |       replace(size_type __pos, size_type __n1, const _CharT* __s)
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2275:7: note:   conversion of argument 3 would be ill-formed:
/usr/include/c++/14/bits/basic_string.h:2275:7: error: invalid conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'const char*' [-fpermissive]
 2275 |       replace(size_type __pos, size_type __n1, const _CharT* __s)
      |       ^~~~~~~
      |       |
      |       __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}
/usr/include/c++/14/bits/basic_string.h:2413:9: note: candidate: 'template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(const_iterator, const_iterator, _InputIterator, _InputIterator) [with <template-parameter-2-2> = _InputIterator; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2413 |         replace(const_iterator __i1, const_iterator __i2,
      |         ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2413:9: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2522:9: note: candidate: 'template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2522 |         replace(size_type __pos, size_type __n, const _Tp& __svt)
      |         ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2522:9: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/14/bits/move.h:37,
                 from /usr/include/c++/14/bits/exception_ptr.h:41,
                 from /usr/include/c++/14/exception:166,
                 from /usr/include/c++/14/ios:41:
/usr/include/c++/14/type_traits: In substitution of 'template<bool _Cond, class _Tp> using std::enable_if_t = typename std::enable_if::type [with bool _Cond = false; _Tp = std::__cxx11::basic_string<char>&]':
/usr/include/c++/14/bits/basic_string.h:149:8:   required by substitution of 'template<class _CharT, class _Traits, class _Alloc> template<class _Tp, class _Res> using std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv = std::enable_if_t<((bool)std::__and_<std::is_convertible<const _Tp&, std::basic_string_view<_CharT, _Traits> >, std::__not_<std::is_convertible<const _Tp*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>*> >, std::__not_<std::is_convertible<const _Tp&, const _CharT*> > >::value), _Res> [with _Tp = char; _Res = std::__cxx11::basic_string<char>&; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  149 |         using _If_sv = enable_if_t<
      |               ^~~~~~
/usr/include/c++/14/bits/basic_string.h:2522:2:   required by substitution of 'template<class _Tp> std::__cxx11::basic_string<char>::_If_sv<_Tp, std::__cxx11::basic_string<char>&> std::__cxx11::basic_string<char>::replace(size_type, size_type, const _Tp&) [with _Tp = char]'
 2522 |         replace(size_type __pos, size_type __n, const _Tp& __svt)
      |         ^~~~~~~
a.cc:21:28:   required from here
   21 |                 str.replace(a+j, a+j, str[b-j]);
      |                 ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/type_traits:2711:11: error: no type named 'type' in 'struct std::enable_if<false, std::__cxx11::basic_string<char>&>'
 2711 |     using enable_if_t = typename enable_if<_Cond, _Tp>::type;
      |           ^~~~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:2540:9: note: candidate: 'template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const _Tp&, size_type, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2540 |         replace(size_type __pos1, size_type __n1, const _Tp& __svt,
      |         ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2540:9: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2562:9: note: candidate: 'template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(const_iterator, const_iterator, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2562 |         replace(const_iterator __i1, const_iterator __i2, const _Tp& __svt)
      |         ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2562:9: note:   template argument deduction/substitution failed:
a.cc:21:30: note:   cannot convert '(a + j)' (type 'int') to type 'std::__cxx11::basic_string<char>::const_iterator'
   21 |                 str.replace(a+j, a+j, str[b-j]);
      |                             ~^~
/usr/include/c++/14/bits/basic_string.h:2200:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2200 |       replace(size_type __pos, size_type __n, const basic_string& __str)
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2200:67: note:   no known conversion for argument 3 from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'const std::__cxx11::basic_string<char>&'
 2200 |       replace(size_type __pos, size_type __n, const basic_string& __str)
      |                                               ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:2223:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, size_type, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2223 |       replace(size_type __pos1, size_type __n1, const basic_string& __str,
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2223:7: note:   candidate expects 5 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2249:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const _CharT*, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2249 |       replace(size_type __pos, size_type __n1, const _CharT* __s,
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2249:7: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2300:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, size_type, _CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2300 |       replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c)
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2300:7: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2319:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(__const_iterator, __const_iterator, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; __const_iterator = std::__cxx11::basic_string<char>::const_iterator]'
 2319 |       replace(__const_iterator __i1, __const_iterator __i2,
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2319:32: note:   no known conversion for argument 1 from 'int' to 'std::__cxx11::basic_string<char>::__const_iterator' {aka 'std::__cxx11::basic_string<char>::const_iterator'}
 2319 |       replace(__const_iterator __i1, __const_iterator __i2,
      |               ~~~~~~~~~~~~~~~~~^~~~
/usr/include/c++/14/bits/basic_string.h:2340:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(__const_iterator, __const_iterator, const _CharT*, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; __const_iterator = std::__cxx11::basic_string<char>::const_iterator; size_type = long unsigned int]'
 2340 |       replace(__const_iterator __i1, __const_iterator __i2,
      |       ^~~~~~~
/usr/