http://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.html MySQL 5.7 Reference Manual / ... / Comparison of B-Tree and Hash Indexes 9.3.8 Comparison of B-Tree and Hash Indexes Understanding the B-tree and hash data structures can help predict h…
Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number must exist in the array. Note: The array size can be very large. Solution that uses too much extra sp…
Given a permutation which may contain repeated numbers, find its index in all the permutations of these numbers, which are ordered in lexicographical order. The index begins at 1. Have you met this question in a real interview? Yes Example Given the…