Eroare de compilare: main.cpp: In function 'void solve()': main.cpp:30:16: error: no match for 'operator[]' (operand types are 'std::vector<int>' and '__gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type' {aka 'std::__cxx11::basic_string<char>'}) 30 | cnt[a[i]][j]]++; | ^ In file included from /usr/include/c++/10/vector:67, from /usr/include/c++/10/queue:61, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:86, from main.cpp:1: /usr/include/c++/10/bits/stl_vector.h:1043:7: note: candidate: 'std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = int; _Alloc = std::allocator<int>; std::vector<_Tp, _Alloc>::reference = int&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]' 1043 | operator[](size_type __n) _GLIBCXX_NOEXCEPT | ^~~~~~~~ /usr/include/c++/10/bits/stl_vector.h:1043:28: note: no known conversion for argument 1 from '__gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type' {aka 'std::__cxx11::basic_string<char>'} to 'std::vector<int>::size_type' {aka 'long unsigned int'} 1043 | operator[](size_type __n) _GLIBCXX_NOEXCEPT | ~~~~~~~~~~^~~ /usr/include/c++/10/bits/stl_vector.h:1061:7: note: candidate: 'std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) const [with _Tp = int; _Alloc = std::allocator<int>; std::vector<_Tp, _Alloc>::const_reference = const int&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]' 1061 | operator[](size_type __n) const _GLIBCXX_NOEXCEPT | ^~~~~~~~ /usr/include/c++/10/bits/stl_vector.h:1061:28: note: no known conversion for argument 1 from '__gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type' {aka 'std::__cxx11::basic_string<char>'} to 'std::vector<int>::size_type' {aka 'long unsigned int'} 1061 | operator[](size_type __n) const _GLIBCXX_NOEXCEPT | ~~~~~~~~~~^~~ Non zero exit status: 1