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• Frequently Asked Questions

• What is a hash function in C++?

  Hash Function: A function that converts a given big phone number to a small practical integer value. The mapped integer value is used as an index in hash table. In simple terms, a hash function maps a big number or string to a small integer that can be used as index in hash table.

• What are the advantages of using hash functions?

  The mapped integer value is used as an index in hash table. In simple terms, a hash function maps a big number or string to a small integer that can be used as index in hash table. 1) Efficiently computable. For example for phone numbers a bad hash function is to take first three digits.

• What is a phone number hash and why is it used?

  Hashing the phone number allows it to not store the original number and to prevent someone to use the same number twice. However, using the same phone number will result in obtaining the same cryptographic hash, so by comparing hashes, we can detect re-use of phone number or email addresses for human verification.

• Should hash functions be uniformly distributed in tables?

  Should uniformly distribute the keys (Each table position equally likely for each key) For example: For phone numbers, a bad hash function is to take the first three digits. A better function is considered the last three digits.