Eroare de compilare: main.cpp: In function 'void dfs1(int, int, int)': main.cpp:33:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for (i = 0; i < a[x].size(); i++) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int)': main.cpp:53:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for (i = 0; i < a[x].size(); i++) { | ~~^~~~~~~~~~~~~ In file included from /usr/include/c++/10/bits/stl_algobase.h:71, from /usr/include/c++/10/bits/char_traits.h:39, from /usr/include/c++/10/ios:40, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/fstream:38, from main.cpp:1: /usr/include/c++/10/bits/predefined_ops.h: In instantiation of 'constexpr bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = std::pair<int, int>*; _Iterator2 = std::pair<int, int>*; _Compare = std::greater<int>]': /usr/include/c++/10/bits/stl_algo.h:82:17: required from 'void std::__move_median_to_first(_Iterator, _Iterator, _Iterator, _Iterator, _Compare) [with _Iterator = std::pair<int, int>*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<std::greater<int> >]' /usr/include/c++/10/bits/stl_algo.h:1924:34: required from '_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = std::pair<int, int>*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<std::greater<int> >]' /usr/include/c++/10/bits/stl_algo.h:1958:38: required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = std::pair<int, int>*; _Size = long int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<std::greater<int> >]' /usr/include/c++/10/bits/stl_algo.h:1974:25: required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = std::pair<int, int>*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<std::greater<int> >]' /usr/include/c++/10/bits/stl_algo.h:4894:18: required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = std::pair<int, int>*; _Compare = std::greater<int>]' main.cpp:77:48: required from here /usr/include/c++/10/bits/predefined_ops.h:156:30: error: no match for call to '(std::greater<int>) (std::pair<int, int>&, std::pair<int, int>&)' 156 | { return bool(_M_comp(*__it1, *__it2)); } | ~~~~~~~^~~~~~~~~~~~~~~~ In file included from /usr/include/c++/10/string:48, from /usr/include/c++/10/bits/locale_classes.h:40, from /usr/include/c++/10/bits/ios_base.h:41, from /usr/include/c++/10/ios:42, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/fstream:38, from main.cpp:1: /usr/include/c++/10/bits/stl_function.h:375:7: note: candidate: 'constexpr bool std::greater<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = int]' 375 | operator()(const _Tp& __x, const _Tp& __y) const | ^~~~~~~~ /usr/include/c++/10/bits/stl_function.h:375:29: note: no known conversion for argument 1 from 'std::pair<int, int>' to 'const int&' 375 | operator()(const _Tp& __x, const _Tp& __y) const | ~~~~~~~~~~~^~~ In file included from /usr/include/c++/10/bits/stl_algobase.h:71, from /usr/include/c++/10/bits/char_traits.h:39, from /usr/include/c++/10/ios:40, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/fstream:38, from main.cpp:1: /usr/include/c++/10/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Val_comp_iter<_Compare>::operator()(_Value&, _Iterator) [with _Value = std::pair<int, int>; _Iterator = std::pair<int, int>*; _Compare = std::greater<int>]': /usr/include/c++/10/bits/stl_algo.h:1826:20: required from 'void std::__unguarded_linear_insert(_RandomAccessIterator, _Compare) [with _RandomAccessIterator = std::pair<int, int>*; _Compare = __gnu_cxx::__ops::_Val_comp_iter<std::greater<int> >]' /usr/include/c++/10/bits/stl_algo.h:1854:36: required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = std::pair<int, int>*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<std::greater<int> >]' /usr/include/c++/10/bits/stl_algo.h:1886:25: required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = std::pair<int, int>*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<std::greater<int> >]' /usr/include/c++/10/bits/stl_algo.h:1977:31: required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = std::pair<int, int>*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<std::greater<int> >]' /usr/include/c++/10/bits/stl_algo.h:4894:18: required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = std::pair<int, int>*; _Compare = std::greater<int>]' main.cpp:77:48: required from here Non zero exit status: 1