Compilare: user.cpp: In function ‘int main()’: user.cpp:29:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[k.n].size();i++) ^ user.cpp:14:14: warning: unused variable ‘j’ [-Wunused-variable] long s,i,j,x,y,n,m; ^ user.cpp:16:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld %ld %ld",&n,&m,&s); ^ user.cpp:19:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld %ld",&x,&y); ^