Compilare: user.cpp: In function ‘void big_ass_add(long long unsigned int*, long long unsigned int*, long long unsigned int*)’: user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void big_ass_scalar_mul(long long unsigned int*, long long unsigned int)’: user.cpp:21: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result