Compilare: user.c: In function `dfs': user.c:16: warning: suggest explicit braces to avoid ambiguous `else' user.c:19: warning: suggest explicit braces to avoid ambiguous `else' user.c: In function `main': user.c:62: warning: use of `ll' length modifier with `f' type character user.c:36: warning: unused variable `j' user.c:36: warning: unused variable `k'