Compilare: main.cpp: In function 'void solve()': main.cpp:37:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for (int i = 0; i < conn[pos].size(); ++i) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:38: warning: 'void* memset(void*, int, size_t)' clearing an object of type 'class std::vector<int>' with no trivial copy-assignment; use assignment or value-initialization instead [-Wclass-memaccess] 59 | memset(conn, 0x0, sizeof conn); | ^ In file included from /usr/include/c++/10/vector:67, from /usr/include/c++/10/queue:61, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:86, from main.cpp:1: /usr/include/c++/10/bits/stl_vector.h:389:11: note: 'class std::vector<int>' declared here 389 | class vector : protected _Vector_base<_Tp, _Alloc> | ^~~~~~ main.cpp:60:38: warning: 'void* memset(void*, int, size_t)' clearing an object of type 'class std::vector<int>' with no trivial copy-assignment; use assignment or value-initialization instead [-Wclass-memaccess] 60 | memset(vall, 0x0, sizeof vall); | ^ In file included from /usr/include/c++/10/vector:67, from /usr/include/c++/10/queue:61, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:86, from main.cpp:1: /usr/include/c++/10/bits/stl_vector.h:389:11: note: 'class std::vector<int>' declared here 389 | class vector : protected _Vector_base<_Tp, _Alloc> | ^~~~~~