View Compilation Error

0_0_28759468_1985.cpp: In function 'double cmp(double)':
0_0_28759468_1985.cpp:31:18: error: 'arr' was not declared in this scope
   tmp = fabs(d - arr[i].loc),sum += (tmp * tmp * tmp * arr[i].weight);
                  ^
0_0_28759468_1985.cpp: In function 'int main()':
0_0_28759468_1985.cpp:84:50: error: 'calu' was not declared in this scope
         printf("Case #%d: %.0lf\n",cnt++,calu(tmp));
                                                  ^