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:117: warning: comparison between signed and unsigned integer expressions user.cpp:124: warning: comparison between signed and unsigned integer expressions user.cpp:130: warning: comparison between signed and unsigned integer expressions user.cpp:134: warning: comparison between signed and unsigned integer expressions user.cpp:170: warning: comparison between signed and unsigned integer expressions user.cpp:190: warning: comparison between signed and unsigned integer expressions user.cpp:203: warning: comparison between signed and unsigned integer expressions user.cpp:237: warning: comparison between signed and unsigned integer expressions user.cpp:248: warning: comparison between signed and unsigned integer expressions user.cpp:255: 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