copaci3.cpp: In function 'int bfs(int, int)': copaci3.cpp:35: warning: comparison between signed and unsigned integer expressions copaci3.cpp: In function 'int main()': copaci3.cpp:52: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result copaci3.cpp:56: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result copaci3.cpp:66: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result