Compilare: user.cpp: In function ‘int main()’: user.cpp:10:15: warning: unused variable ‘nod’ [-Wunused-variable] int i,n,m,nod,a,b,ist,sz; ^ user.cpp:13:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^ user.cpp:15:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&a,&b); ^