Compilare: user.cpp: In function ‘int main()’: user.cpp:8:15: warning: unused variable ‘l’ [-Wunused-variable] int n,k,i,l,q,w,b,j,r,d,s; ^ user.cpp:8:25: warning: unused variable ‘r’ [-Wunused-variable] int n,k,i,l,q,w,b,j,r,d,s; ^ user.cpp:8:27: warning: unused variable ‘d’ [-Wunused-variable] int n,k,i,l,q,w,b,j,r,d,s; ^ user.cpp:11:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&k); ^ user.cpp:15:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d ",&a[i]); ^ user.cpp:32:33: warning: ‘w’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(g,"%d %d %d",b,w+1,q); ^