taxa.cpp: In function 'void bfs(int, int, int, int)': taxa.cpp:14: warning: unused variable 'cost' taxa.cpp: In function 'int main()': taxa.cpp:41: warning: unused variable 's' taxa.cpp:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result taxa.cpp:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result taxa.cpp:47: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result