Compilare: user.cpp: In function ‘void read()’: user.cpp:24:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &m); ^ user.cpp:27:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(w); ^ user.cpp: In function ‘void queries()’: user.cpp:39:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:42:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &word[i]), word[i] --; ^ user.cpp:37:14: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] bool ok; ^ /tmp/cc1g6TtM.o: In function `read()': user.cpp:(.text+0x350): warning: the `gets' function is dangerous and should not be used.