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:15:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s-1;i++) ^ 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); ^