Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void doo(int)’: user.cpp:33: warning: integer overflow in expression user.cpp:39: warning: comparison between signed and unsigned integer expressions user.cpp:49: warning: comparison between signed and unsigned integer expressions user.cpp:59: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void doey(int)’: user.cpp:77: warning: integer overflow in expression user.cpp:83: warning: comparison between signed and unsigned integer expressions user.cpp:92: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:108: warning: unused variable ‘j’