** Compute the optimal size for the array part of table 't'. 'nums' is a ** "count array" where 'nums[i]' is the number of integers in the table ** between 2^(i - 1) + 1 and 2^i. 'pna' enters with the total number of ** integer keys in the table and leaves with the number of keys that ** will go to the array part; return the optimal size. (The condition ** 'twotoi > 0' in the for loop stops the l
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