Compilare: user.cpp: In function ‘int main()’: user.cpp:10:20: warning: unused variable ‘r’ [-Wunused-variable] long i,j,x,y,p,r,nr,x1,y1; ^ user.cpp:10:25: warning: unused variable ‘x1’ [-Wunused-variable] long i,j,x,y,p,r,nr,x1,y1; ^ user.cpp:10:28: warning: unused variable ‘y1’ [-Wunused-variable] long i,j,x,y,p,r,nr,x1,y1; ^ user.cpp:11:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld %ld",&n,&m); ^ user.cpp:14:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&x); ^ user.cpp:24:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld %ld",&x,&y); ^