Example Analysis of python selection sorting algorithm

This article mainly introduces the example analysis of python selection sorting algorithm, which is very detailed and has a certain reference value. Interested friends must read it!

1. The selection sort only needs one variable as an exchange, so the space complexity is O (1), which is an in-situ sorting algorithm.

2. The selection sort selects the minimum value in the unsorted interval and exchanges with the previous elements.

For elements with the same value, it is an unstable sorting algorithm because swapping destroys their relative buses.

For example, a sequence like 4, 1, 1, 4, 2, 5,

The first selection is as follows: 1, 4, 4, 2, 5, the order remains the same at this time, and after the second selection is as follows: 1, 2, 4, 4, 5, the first 4 and 2 need to be exchanged, so the relative order of the two 4s has changed. so selection sorting is an unstable sorting algorithm.

Regardless of the initial state of the data, selection sorting requires selecting the smallest or largest element among the unsorted elements to exchange with the first and last elements in the unsorted sequence, so the best, worst, and average time complexity is O (n ^ 2).

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