Compilare: user.cpp: In function ‘void read()’: user.cpp:68:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ user.cpp:69:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(Mask + 1); ^ user.cpp: In function ‘int main()’: user.cpp:167:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &T); ^ /tmp/cculYXG5.o: In function `read()': user.cpp:(.text+0x23b): warning: the `gets' function is dangerous and should not be used.