Compilare: main.cpp: In function 'void BFS(int)': main.cpp:18:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(l=0;l<N[j].size();l++){ | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:17: warning: 'lastj' may be used uninitialized [-Wmaybe-uninitialized] 63 | if(lastj==j){ | ^~ main.cpp:35:31: note: 'lastj' was declared here 35 | int m,arm,x,y,s=0,j,lasti,lastj; | ^~~~~