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View Compilation Error

0_0_30409666_15625.cpp: In function 'int dist(int, int)':
0_0_30409666_15625.cpp:137:67: error: 'u' was not declared in this scope
  return (abs(x[p1]-x[p2])+abs(y[p1]-y[p2])+abs(z[p1]-z[p2]))*b+ z[u]>=z[v]?0:c;
                                                                   ^


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