Compilare: user.cpp: In function ‘long long int rid(long long int, long long int)’: user.cpp:35: warning: suggest parentheses around comparison in operand of ‘&’ user.cpp: In function ‘int main()’: user.cpp:44: warning: format ‘%d’ expects type ‘int*’, but argument 2 has type ‘long long int*’ 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 ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result