Compilare: main.cpp: In function 'int main()': main.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<G[act].size();++i) ~^~~~~~~~~~~~~~ main.cpp:19:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ main.cpp:22:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&x,&y); ^