Compilare: main.cpp: In function 'void dfs(int)': main.cpp:9:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 9 | for(int i=0;i<l[x].size();i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:29:12: warning: unused variable 'x' [-Wunused-variable] 29 | int i,x,y,nrc=0; | ^ main.cpp:29:14: warning: unused variable 'y' [-Wunused-variable] 29 | int i,x,y,nrc=0; | ^