Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:26: warning: comparison between signed and unsigned integer expressions user.cpp:32: warning: no return statement in function returning non-void user.cpp: In function ‘int dfs2(int)’: user.cpp:42: warning: comparison between signed and unsigned integer expressions user.cpp:47: warning: no return statement in function returning non-void user.cpp: In function ‘int dfs3(int, int)’: user.cpp:72: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:121: warning: comparison between signed and unsigned integer expressions user.cpp:128: warning: comparison between signed and unsigned integer expressions user.cpp:135: warning: comparison between signed and unsigned integer expressions user.cpp:139: warning: comparison between signed and unsigned integer expressions user.cpp:176: warning: comparison between signed and unsigned integer expressions user.cpp:196: warning: comparison between signed and unsigned integer expressions user.cpp:209: warning: comparison between signed and unsigned integer expressions user.cpp:243: warning: comparison between signed and unsigned integer expressions user.cpp:254: warning: comparison between signed and unsigned integer expressions user.cpp:261: warning: comparison between signed and unsigned integer expressions user.cpp:92: warning: unused variable ‘m’ user.cpp: In function ‘int dfs3(int, int)’: user.cpp:87: warning: control reaches end of non-void function