Compilare: main.cpp: In function 'void bfs(int, int*)': main.cpp:22:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(i=0;i<g[k].size();++i) { | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:16: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized] 52 | fout<<ans<<"\n"; | ^~~~ main.cpp:33:21: note: 'ans' was declared here 33 | int n,m,x,y,a,b,ans,i; | ^~~