Compilare: main.cpp: In function 'void bfs(int)': main.cpp:17:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[act].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fof.in","r",stdin); ^ main.cpp:37:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fof.out","w",stdout); ^