Compilare: user.cpp:77:2: warning: no newline at end of file user.cpp: In function 'int solution()': user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:63: warning: operation on 'i' may be undefined user.cpp: In function 'int solution()': user.cpp:27: warning: 'node' may be used uninitialized in this function