bile1.cpp: In function 'void dfs1(int)': bile1.cpp:15: warning: comparison between signed and unsigned integer expressions bile1.cpp: In function 'void dfs2(int)': bile1.cpp:22: warning: comparison between signed and unsigned integer expressions bile1.cpp: In function 'int main()': bile1.cpp:34: warning: statement has no effect bile1.cpp:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result bile1.cpp:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result