Compilare: main.cpp: In function 'std::tuple<int, int, int> findMaxBFS(int, int)': main.cpp:82:13: warning: unused variable 'cost' [-Wunused-variable] 82 | int cost = q.front().first; | ^~~~ main.cpp: In function 'void read()': main.cpp:144:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 144 | for (int i = 0; i < MST[x].size(); ++i) | ~~^~~~~~~~~~~~~~~ main.cpp:148:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 148 | for (int i = 0; i < MST[y].size(); ++i) | ~~^~~~~~~~~~~~~~~ main.cpp:157:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 157 | for (int i = 0; i < MST[u].size(); ++i) | ~~^~~~~~~~~~~~~~~ main.cpp:161:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 161 | for (int i = 0; i < MST[v].size(); ++i) | ~~^~~~~~~~~~~~~~~ In file included from main.cpp:7: In constructor 'constexpr std::_Head_base<_Idx, _Head, false>::_Head_base(_UHead&&) [with _UHead = int&; long unsigned int _Idx = 2; _Head = int]', inlined from 'constexpr std::_Tuple_impl<_Idx, _Head>::_Tuple_impl(_UHead&&) [with _UHead = int&; long unsigned int _Idx = 2; _Head = int]' at /usr/include/c++/12.2.1/tuple:441:38, inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int&}; <template-parameter-2-3> = void; long unsigned int _Idx = 1; _Head = int; _Tail = {int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int&, int&}; <template-parameter-2-3> = void; long unsigned int _Idx = 0; _Head = int; _Tail = {int, int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {int&, int&, int&}; bool _Valid = true; typename std::enable_if<_TCC<_Valid>::__is_implicitly_constructible<_UElements ...>(), bool>::type <anonymous> = true; _Elements = {int, int, int}]' at /usr/include/c++/12.2.1/tuple:744:54, inlined from 'std::tuple<int, int, int> findMaxBFS(int, int)' at main.cpp:99:41: /usr/include/c++/12.2.1/tuple:200:11: warning: 'saved_v' may be used uninitialized [-Wmaybe-uninitialized] 200 | : _M_head_impl(std::forward<_UHead>(__h)) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'std::tuple<int, int, int> findMaxBFS(int, int)': main.cpp:75:18: note: 'saved_v' was declared here 75 | int saved_u, saved_v; | ^~~~~~~ In constructor 'constexpr std::_Head_base<_Idx, _Head, false>::_Head_base(_UHead&&) [with _UHead = int&; long unsigned int _Idx = 1; _Head = int]', inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int&}; <template-parameter-2-3> = void; long unsigned int _Idx = 1; _Head = int; _Tail = {int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int&, int&}; <template-parameter-2-3> = void; long unsigned int _Idx = 0; _Head = int; _Tail = {int, int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {int&, int&, int&}; bool _Valid = true; typename std::enable_if<_TCC<_Valid>::__is_implicitly_constructible<_UElements ...>(), bool>::type <anonymous> = true; _Elements = {int, int, int}]' at /usr/include/c++/12.2.1/tuple:744:54, inlined from 'std::tuple<int, int, int> findMaxBFS(int, int)' at main.cpp:99:41: /usr/include/c++/12.2.1/tuple:200:11: warning: 'saved_u' may be used uninitialized [-Wmaybe-uninitialized] 200 | : _M_head_impl(std::forward<_UHead>(__h)) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'std::tuple<int, int, int> findMaxBFS(int, int)': main.cpp:75:9: note: 'saved_u' was declared here 75 | int saved_u, saved_v; | ^~~~~~~