Compilare: user.cpp:41:2: warning: "/*" within comment user.cpp:57:2: warning: no newline at end of file user.cpp: In function 'void dfs(int, int)': user.cpp:15: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp:28: warning: unused variable 't'