foo.c: In function 'main':
foo.c:32:17: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
    int total1 = abs(b[index][1] - b[index - 1][1]) + abs(b[index][2] - b[index - 1][2]);
                 ^~~
foo.c: In function 'Sort':
foo.c:48:6: warning: unused variable 'imax' [-Wunused-variable]
  int imax = 0;
      ^~~~

自豪的采用jd5进行评测(github.com/masnn/jd5)