Compilare: user.cpp: In function ‘int main()’: user.cpp:386: warning: comparison between signed and unsigned integer expressions user.cpp:398: warning: comparison between signed and unsigned integer expressions user.cpp:399: warning: comparison between signed and unsigned integer expressions user.cpp:405: warning: comparison between signed and unsigned integer expressions user.cpp:406: warning: comparison between signed and unsigned integer expressions user.cpp:418: warning: comparison between signed and unsigned integer expressions user.cpp:419: warning: comparison between signed and unsigned integer expressions user.cpp:438: warning: comparison between signed and unsigned integer expressions user.cpp:439: warning: comparison between signed and unsigned integer expressions user.cpp:449: warning: comparison between signed and unsigned integer expressions user.cpp:450: warning: comparison between signed and unsigned integer expressions user.cpp:455: warning: comparison between signed and unsigned integer expressions user.cpp:456: warning: comparison between signed and unsigned integer expressions user.cpp:465: warning: comparison between signed and unsigned integer expressions user.cpp:318: warning: unused variable ‘lastj’ user.cpp:321: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:323: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:325: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:468: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result