Main.cc: In function ‘int main()’: Main.cc:15:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ^ Main.cc:16:12: error: no match for ‘operator-’ (operand types are ‘std::string {aka std::basic_string<char>}’ and ‘char’) a[s-'a']++; ^ Main.cc:16:12: note: candidates are: In file included from /usr/include/c++/4.8.2/bits/stl_algobase.h:67:0, from /usr/include/c++/4.8.2/bits/char_traits.h:39, from /usr/include/c++/4.8.2/ios:40, from /usr/include/c++/4.8.2/istream:38, from /usr/include/c++/4.8.2/sstream:38, from /usr/include/c++/4.8.2/complex:45, from /usr/include/c++/4.8.2/ccomplex:38, from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/stdc++.h:52, from Main.cc:1: /usr/include/c++/4.8.2/bits/stl_iterator.h:327:5: note: template<class _Iterator> typename std::reverse_iterator<_Iterator>::difference_type std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&) operator-(const reverse_iterator<_Iterator>& __x, ^ /usr/include/c++/4.8.2/bits/stl_iterator.h:327:5: note: template argument deduction/substitution failed: Main.cc:16:13: note: ‘std::string {aka std::basic_string<char>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’ a[s-'a']++; ^ In file included from /usr/include/c++/4.8.2/bits/stl_algobase.h:67:0, from /usr/include/c++/4.8.2/bits/char_traits.h:39, from /usr/include/c++/4.8.2/ios:40, from /usr/include/c++/4.8.2/istream:38, from /usr/include/c++/4.8.2/sstream:38, from /usr/include/c++/4.8.2/complex:45, from /usr/include/c++/4.8.2/ccomplex:38, from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/stdc++.h:52, from Main.cc:1: /usr/include/c++/4.8.2/bits/stl_iterator.h:379:5: note: template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&) operator-(const reverse_iterator<_IteratorL>& __x, ^ /usr/include/c++/4.8.2/bits/stl_iterator.h:379:5: note: template argument deduction/substitution failed: Main.cc:16:13: note: ‘std::string {aka std::basic_string<char>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’ a[s-'a']++; ^ In file included from /usr/include/c++/4.8.2/bits/stl_algobase.h:67:0, from /usr/include/c++/4.8.2/bits/char_traits.h:39, from /usr/include/c++/4.8.2/ios:40, from /usr/include/c++/4.8.2/istream:38, from /usr/include/c++/4.8.2/sstream:38, from /usr/include/c++/4.8.2/complex:45, from /usr/include/c++/4.8.2/ccomplex:38, from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/stdc++.h:52, from Main.cc:1: /usr/include/c++/4.8.2/bits/stl_iterator.h:1104:5: note: template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&) operator-(const move_iterator<_IteratorL>& __x, ^ /usr/include/c++/4.8.2/bits/stl_iterator.h:1104:5: note: template argument deduction/substitution failed: Main.cc:16:13: note: ‘std::string {aka std::basic_string<char>}’ is not derived from ‘const std::move_iterator<_Iterator>’ a[s-'a']++; ^ In file included from /usr/include/c++/4.8.2/bits/stl_algobase.h:67:0, from /usr/include/c++/4.8.2/bits/char_traits.h:39, from /usr/include/c++/4.8.2/ios:40, from /usr/include/c++/4.8.2/istream:38, from /usr/include/c++/4.8.2/sstream:38, from /usr/include/c++/4.8.2/complex:45, from /usr/include/c++/4.8.2/ccomplex:38, from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/stdc++.h:52, from Main.cc:1: /usr/include/c++/4.8.2/bits/stl_iterator.h:1111:5: note: template<class _Iterator> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&) operator-(const move_iterator<_Iterator>& __x, ^ /usr/include/c++/4.8.2/bits/stl_iterator.h:1111:5: note: template argument deduction/substitution failed: Main.cc:16:13: note: ‘std::string {aka std::basic_string<char>}’ is not derived from ‘const std::move_iterator<_Iterator>’ a[s-'a']++; ^ In file included from /usr/include/c++/4.8.2/ccomplex:38:0, from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/stdc++.h:52, from Main.cc:1: /usr/include/c++/4.8.2/complex:354:5: note: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const std::complex<_Tp>&) operator-(const complex<_Tp>& __x, const complex<_Tp>& __y) ^ /usr/include/c++/4.8.2/complex:354:5: note: template argument deduction/substitution failed: Main.cc:16:13: note: ‘std::string {aka std::basic_string<char>}’ is not derived from ‘const std::complex<_Tp>’ a[s-'a']++; ^ In file included from /usr/include/c++/4.8.2/ccomplex:38:0, from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/stdc++.h:52, from Main.cc:1: /usr/include/c++/4.8.2/complex:363:5: note: template<class _Tp> std::complex<_Tp> std::opera

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