Compilare: user.cpp: In function ‘int main()’: user.cpp:22:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s.size()>nr) ^ user.cpp:16:22: warning: unused variable ‘j’ [-Wunused-variable] int n,nr=0,i,x,y,j,p,u,m,verif=0,aux; ^ user.cpp:16:30: warning: unused variable ‘verif’ [-Wunused-variable] int n,nr=0,i,x,y,j,p,u,m,verif=0,aux; ^ user.cpp:17:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:20:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^