Compilare: user.cpp: In function ‘void readData()’: user.cpp:70:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d ",&n, &k); ^ user.cpp:71:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/cc7I0kus.o: In function `readData()': user.cpp:(.text+0x8f): warning: the `gets' function is dangerous and should not be used.