Compilare: user.cpp: In function ‘int main()’: user.cpp:11:17: warning: unused variable ‘u’ [-Wunused-variable] int n,m,i,j,u,max,p,a,b; ^ user.cpp:11:23: warning: unused variable ‘p’ [-Wunused-variable] int n,m,i,j,u,max,p,a,b; ^ user.cpp:12:30: 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:16:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&a); ^