Compilare: main.cpp: In function 'void veccheck(int)': main.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i=0;i<gr[cur].size();i++) | ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:34:9: warning: unused variable 'val' [-Wunused-variable] 34 | int val=0; | ^~~