Compilare: user.cpp: In function ‘void euler(int)’: user.cpp:70:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<G[start].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:24:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ user.cpp:27:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&x,&y); ^ user.cpp: In function ‘int cb(int, int)’: user.cpp:64:1: warning: control reaches end of non-void function [-Wreturn-type] } ^