/in/foo.cc: In function 'int main()':
/in/foo.cc:4:164: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
 {int n,i,j,s,m,a[10000];scanf("%d",&n);for(i=1;i<=n;i++)scanf("%d",&a[i]);for(i=1;i<=n;i++){s=0;for(j=1;j<=n;j++)s+=abs(a[j]-a[i]);if(i==1||s<m)m=s;}printf("%d",m);}
                                                                                                                                                                    ^