Compilare: user.cpp: In function ‘int main()’: user.cpp:47:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,cnt,n,m,x,y; ^ user.cpp:49:29: 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:53:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^ user.cpp:61:18: warning: ‘cnt’ may be used uninitialized in this function [-Wmaybe-uninitialized] cnt++; ^