Compilare: user.cpp: In function ‘void rezolva()’: user.cpp:78: warning: comparison between signed and unsigned integer expressions user.cpp:83: warning: comparison between signed and unsigned integer expressions user.cpp:63: warning: unused variable ‘k’ user.cpp: In function ‘int main()’: user.cpp:132: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result