Compilare: user.cpp: In function ‘void rezolva()’: user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:89: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void rezolva()’: user.cpp:55: warning: ‘j’ may be used uninitialized in this function