Compilare: user.cpp: In function ‘long int A(int, int)’: user.cpp:11: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘long long int f(int)’: user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp:18: warning: unused variable ‘j’ user.cpp:18: warning: unused variable ‘p’ user.cpp: In function ‘int main()’: user.cpp:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result