View Compilation Error

0_0_2673629_30695.cpp: In function `int main()':
0_0_2673629_30695.cpp:23: error: invalid conversion from `int' to `const char*'
0_0_2673629_30695.cpp:23: error:   initializing argument 1 of `std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]'
0_0_2673629_30695.cpp:25: error: no match for 'operator>' in '(&it)->std::_Rb_tree_iterator<_Tp>::operator-> [with _Tp = std::pair<const std::string, int>]()->std::pair<const std::string, int>::second > cnt'