Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i=0; i<v[nr].size(); i++) | ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:8: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] 46 | dfs(last); | ~~~^~~~~~