Compilare: user.cpp: In function ‘int main()’: user.cpp:53: warning: comparison between signed and unsigned integer expressions user.cpp:61: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘ll’ user.cpp:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result