Compilare: main.cpp: In function 'void bfs()': main.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=1;i<=n;i++) ^~~ main.cpp:38:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~