Compilare: user.cpp: In function ‘bool cmp(power, power)’: user.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a.putere.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:28:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mesaje.in", "r", stdin); ^ user.cpp:29:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mesaje.out", "w", stdout); ^