Compilare: user.cpp: In function ‘int main()’: user.cpp:11:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s>c) ^ user.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s;i++) ^ user.cpp:6:15: warning: variable ‘f2’ set but not used [-Wunused-but-set-variable] FILE *f1,*f2; ^ user.cpp:9:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%ld %ld %u",&a,&b,&c); ^