Compilare: user.cpp: In function 'void dfs(int)': user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void dfsGT(int, int)': user.cpp:33: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void bford(int)': user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:88: warning: comparison between signed and unsigned integer expressions user.cpp:110: warning: comparison between signed and unsigned integer expressions