/in/foo.c: In function 'main':
/in/foo.c:17:14: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
    x[z]=x[z]+abs(a[d]-m);
              ^~~
/in/foo.c:9:10: warning: unused variable 's' [-Wunused-variable]
  int d,z,s,m;
          ^