Compilare: main.cpp: In function 'void dfs(int)': main.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int l=0;l<v[k].size();l++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:24:29: 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] 24 | memset(v,0,sizeof(v)); | ^ In file included from /usr/include/c++/10/vector:67, from main.cpp:3: /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> | ^~~~~~