Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:23: warning: comparison between signed and unsigned integer expressions user.cpp:29: warning: no return statement in function returning non-void user.cpp: In function ‘int dfs2(int)’: user.cpp:39: warning: comparison between signed and unsigned integer expressions user.cpp:44: warning: no return statement in function returning non-void user.cpp: In function ‘int dfs3(int, int)’: user.cpp:69: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:120: warning: comparison between signed and unsigned integer expressions user.cpp:127: warning: comparison between signed and unsigned integer expressions user.cpp:130: warning: comparison between signed and unsigned integer expressions user.cpp:181: warning: comparison between signed and unsigned integer expressions user.cpp:87: warning: unused variable ‘m’ user.cpp: In function ‘int dfs3(int, int)’: user.cpp:82: warning: control reaches end of non-void function