Compilare: user.cpp: In function ‘int main()’: user.cpp:32:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p3[mid]<=n) ^ user.cpp:14:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&t); ^ user.cpp:20:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld",&n); ^