Compilare: main.cpp: In function 'void DFS(int)': main.cpp:32:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0 ; i<v[nod].size() ; i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int cmp2(muchie, muchie)': main.cpp:90:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:95:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ninjago.in","r",stdin); ^ main.cpp:96:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ninjago.out","w",stdout); ^