Compilare: main.cpp: In function 'void euler(int)': main.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=nex[nod];t<v[nod].size();t++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ main.cpp:42:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&x,&y); ^