bile1.cpp: In function `void dfs1(int)': bile1.cpp:8: warning: comparison between signed and unsigned integer expressions bile1.cpp: In function `void dfs2(int)': bile1.cpp:18: warning: comparison between signed and unsigned integer expressions bile1.cpp: In function `int main()': bile1.cpp:34: warning: comparison between signed and unsigned integer expressions bile1.cpp:44: warning: comparison between signed and unsigned integer expressions bile1.cpp:50: warning: comparison between signed and unsigned integer expressions bile1.cpp:56: warning: comparison between signed and unsigned integer expressions bile1.cpp:58: warning: comparison between signed and unsigned integer expressions