Compilare: user.cpp: In function ‘int main()’: user.cpp:381: warning: comparison between signed and unsigned integer expressions user.cpp:393: warning: comparison between signed and unsigned integer expressions user.cpp:394: warning: comparison between signed and unsigned integer expressions user.cpp:400: warning: comparison between signed and unsigned integer expressions user.cpp:401: warning: comparison between signed and unsigned integer expressions user.cpp:413: warning: comparison between signed and unsigned integer expressions user.cpp:414: warning: comparison between signed and unsigned integer expressions user.cpp:433: warning: comparison between signed and unsigned integer expressions user.cpp:434: warning: comparison between signed and unsigned integer expressions user.cpp:444: warning: comparison between signed and unsigned integer expressions user.cpp:445: warning: comparison between signed and unsigned integer expressions user.cpp:450: warning: comparison between signed and unsigned integer expressions user.cpp:451: warning: comparison between signed and unsigned integer expressions user.cpp:460: warning: comparison between signed and unsigned integer expressions user.cpp:313: warning: unused variable ‘lastj’ user.cpp:316: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:318: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:320: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:463: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result