Compilare: user.cpp: In function ‘int main()’: user.cpp:220:13: warning: unused variable ‘key’ [-Wunused-variable] int key = cheie ( i ) ; ^ user.cpp:190:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( IN , "r" , stdin ) ; ^ user.cpp:191:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( OUT, "w" , stdout ) ; ^ user.cpp:193:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d\n" , &n ) ; ^ user.cpp:196:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%c\n" , &c ) ; ^