CC150 20.6

20.6 Describe an algorithm to find the largest 1 million numbers in 1 billion numbers. Assume that the computer memory can hold all one billion numbers.

// can hold all numbers.
// Cheating!

// Do we know the max or min?
// Consider using bitmap

// If 1 billion numbers also spread a lot.
// 1. Hash-split into K smaller pieces. Just % n. Thinking about how to handle negative numbers.
// Dealing with the small files.
// Maintain a min heap with 1 million. (so said)

// Random select K as pivok.
// Track numbers bigger than K.
// If # > 1m, pivot right, to find 1m
// else, pivot left, (1m - #)
时间： 2024-10-12 00:40:23

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