Eroare de compilare: main.cpp: In function 'int main()': main.cpp:25:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[a].size(); i++) ~^~~~~~~~~~~~ main.cpp:34:41: error: no match for 'operator<' (operand types are 'std::ofstream {aka std::basic_ofstream<char>}' and 'const char [4]') if (dist[i]==0 && i!=s) cout<"-1 "; else cout<<dist[i]-1<<" "; ~~~~^~~~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:1: /usr/include/c++/6/bits/regex.h:962:5: note: candidate: template<class _BiIter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&) operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) ^~~~~~~~ /usr/include/c++/6/bits/regex.h:962:5: note: template argument deduction/substitution failed: main.cpp:34:42: note: 'std::ofstream {aka std::basic_ofstream<char>}' is not derived from 'const std::__cxx11::sub_match<_BiIter>' if (dist[i]==0 && i!=s) cout<"-1 "; else cout<<dist[i]-1<<" "; ^~~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:1: /usr/include/c++/6/bits/regex.h:1041:5: note: candidate: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const std::__cxx11::sub_match<_BiIter>&) operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, ^~~~~~~~ /usr/include/c++/6/bits/regex.h:1041:5: note: template argument deduction/substitution failed: main.cpp:34:42: note: 'std::ofstream {aka std::basic_ofstream<char>}' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>' if (dist[i]==0 && i!=s) cout<"-1 "; else cout<<dist[i]-1<<" "; ^~~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:1: /usr/include/c++/6/bits/regex.h:1121:5: note: candidate: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&) operator<(const sub_match<_Bi_iter>& __lhs, ^~~~~~~~ /usr/include/c++/6/bits/regex.h:1121:5: note: template argument deduction/substitution failed: main.cpp:34:42: note: 'std::ofstream {aka std::basic_ofstream<char>}' is not derived from 'const std::__cxx11::sub_match<_BiIter>' if (dist[i]==0 && i!=s) cout<"-1 "; else cout<<dist[i]-1<<" "; ^~~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:1: /usr/include/c++/6/bits/regex.h:1198:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type*, const std::__cxx11::sub_match<_BiIter>&) operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs, ^~~~~~~~ /usr/include/c++/6/bits/regex.h:1198:5: note: template argument deduction/substitution failed: main.cpp:34:42: note: mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'const char [4]' if (dist[i]==0 && i!=s) cout<"-1 "; else cout<<dist[i]-1<<" "; ^~~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:1: Non zero exit status: 1