You could do this, which would be O(N): Run through element in every array. For each one, you would do this:

  1. Increment a counter
  2. Add to a running total
  3. Keep track of the highest value you find.

Now, if the highest value you find isn't equal to your counter - 1 (subtract one because of the zero), you know you have a problem. And, if the total is not equal to the summation of 1 to your higest value, then you have a problem also. Otherwise, everything is correct.

In reply to Re: joining and sorting arrays by ehdonhon
in thread joining and sorting arrays by hotshot

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