How Sorting Algorithms Implement Ascending/Descending Order? A Guide for Data "Obedience"

This article introduces methods for sorting algorithms to implement data in ascending/descending order, with the core being to make data "obey" through algorithmic rules. The significance of sorting: arranging messy data in ascending order (from small to large) or descending order (from large to small), such as organizing playing cards. Three basic algorithm implementation rules: 1. **Bubble Sort**: When ascending, large numbers "bubble" and move backward (swap if front > back); when descending, small numbers "sink" and move backward (swap if front < back), like bubbles rising/falling. 2. **Selection Sort**: When ascending, select the smallest number in each round and place it on the left; when descending, select the largest number and place it on the left, similar to selecting class monitors to take their positions in order. 3. **Insertion Sort**: When ascending, insert the new number into the correct position in the already sorted part (from left to right, increasing); similarly for descending (from left to right, decreasing), like inserting playing cards into a sorted sequence. Core logic: Adjust the comparison rule (> or <) to determine the data movement direction. Ascending/descending order essentially involves "making data move according to the rules". It is recommended to first master basic algorithms and manually simulate data movement to understand the logic.