Compilare: main.cpp: In function 'int main()': main.cpp:23:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int i=0; i<G[s].size(); i++){ | ~^~~~~~~~~~~~ main.cpp:16:19: warning: variable 'e' set but not used [-Wunused-but-set-variable] 16 | int l=0, r=0, e=0, s1=s, op; | ^ main.cpp:16:30: warning: unused variable 'op' [-Wunused-variable] 16 | int l=0, r=0, e=0, s1=s, op; | ^~