bile1.cpp: In function `void dfsN(int)': bile1.cpp:15: warning: comparison between signed and unsigned integer expressions bile1.cpp: In function `void dfsN2(int)': bile1.cpp:24: warning: comparison between signed and unsigned integer expressions bile1.cpp: In function `void dfsT(int)': bile1.cpp:34: warning: comparison between signed and unsigned integer expressions bile1.cpp: In function `void dfsT2(int)': bile1.cpp:43: warning: comparison between signed and unsigned integer expressions bile1.cpp: In function `int main()': bile1.cpp:50: warning: unused variable `int j' bile1.cpp:75:2: warning: no newline at end of file