Compilare: user.cpp: In function ‘int main()’: user.cpp:33:10: warning: statement has no effect [-Wunused-value] for(m;m>0;m--){ ^ user.cpp:30:29: 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:34:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&op,&x,&y); ^