Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp:30: warning: no return statement in function returning non-void user.cpp: In function ‘int dfs2(int)’: user.cpp:40: warning: comparison between signed and unsigned integer expressions user.cpp:45: warning: no return statement in function returning non-void user.cpp: In function ‘int dfs3(int, int)’: user.cpp:70: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:116: warning: comparison between signed and unsigned integer expressions user.cpp:122: warning: comparison between signed and unsigned integer expressions user.cpp:128: warning: comparison between signed and unsigned integer expressions user.cpp:132: warning: comparison between signed and unsigned integer expressions user.cpp:166: warning: comparison between signed and unsigned integer expressions user.cpp:187: warning: comparison between signed and unsigned integer expressions user.cpp:200: warning: comparison between signed and unsigned integer expressions user.cpp:221: warning: comparison between signed and unsigned integer expressions user.cpp:88: warning: unused variable ‘m’ user.cpp: In function ‘int dfs3(int, int)’: user.cpp:83: warning: control reaches end of non-void function