Compilare: user.cpp: In function ‘int main()’: user.cpp:154: warning: comparison between signed and unsigned integer expressions user.cpp:132: warning: unused variable ‘j’ user.cpp:130: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:131: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:133: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:136: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:164: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:168: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result