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notes50 - CS 251 Collision Handling Techniques by Brad...

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Unformatted text preview: CS 251: Collision Handling Techniques - by Brad Prugar Monday, February 13, 2006 15:30 PM 0 maxSize -1 <--key • Example: hash(k) = k mod 7 insert 18 hash(18) = 18 % 7 = 4 0 1 2 3 4 5 6 0 1 2 3 4 5 6 18 insert 41 hash(41) = 41 % 7 = 6 0 1 2 3 4 5 6 18 41 insert 22 hash(22) = 22 % 7 = 1 0 1 2 3 4 5 6 18 41 22 insert 43 hash(43) = 43 % 7 = 1 (in use) Increase probe = 2 0 1 2 3 4 5 6 22 43 18 41 Double Hashing o It is like linear probing but instead of incrementing by 1, the probe is incremented by a value given by a second hash function. double_hash_insert(k, d) { if (table is full) { Return error } probe = hash1(k); offset = hash2(k); while (table[probe] is in use) { probe = (probe + offset) % MaxSize;...
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notes50 - CS 251 Collision Handling Techniques by Brad...

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