implementations of bubble sort, insertion sort and selection sort in python

Author: jerryderry

python/11_sorts/sorts.py

@@ -0,0 +1,95 @@
+"""
+ Bubble sort, insertion sort and selection sort
+ 冒泡排序、插入排序、选择排序
+
+ Author: Wenru
+"""
+
+from typing import List
+
+# 冒泡排序
+def bubble_sort(a: List[int]):
+ if len(a) <= 1: return
+ 
+ made_swap = False
+ for i in range(len(a)):
+ for j in range(len(a) - i - 1):
+ if a[j] > a[j+1]:
+ a[j], a[j+1] = a[j+1], a[j]
+ made_swap = True
+ if not made_swap: break
+
+# 插入排序
+def insertion_sort(a: List[int]):
+ if len(a) <= 1: return
+ 
+ for i in range(1, len(a)):
+ value = a[i]
+ j = i - 1
+ while j >= 0 and a[j] > value:
+ a[j+1] = a[j]
+ j -= 1
+ a[j+1] = value
+
+# 选择排序
+def selection_sort(a: List[int]):
+ if len(a) <= 1: return
+ 
+ for i in range(len(a)):
+ min_index = i
+ min_val = a[i]
+ for j in range(i, len(a)):
+ if a[j] < min_val:
+ min_val = a[j]
+ min_index = j
+ a[i], a[min_index] = a[min_index], a[i]
+
+
+if __name__ == "__main__":
+ array = [1, 1, 1, 1]
+ bubble_sort(array)
+ print(array)
+
+ array = [1, 2, 3, 4]
+ bubble_sort(array)
+ print(array)
+
+ array = [4, 3, 2, 1]
+ bubble_sort(array)
+ print(array)
+
+ array = [5, 6, -1, 4, 2, 8, 10, 7, 6]
+ bubble_sort(array)
+ print(array)
+
+ array = [1, 1, 1, 1]
+ insertion_sort(array)
+ print(array)
+
+ array = [1, 2, 3, 4]
+ insertion_sort(array)
+ print(array)
+
+ array = [4, 3, 2, 1]
+ insertion_sort(array)
+ print(array)
+
+ array = [5, 6, -1, 4, 2, 8, 10, 7, 6]
+ insertion_sort(array)
+ print(array)
+
+ array = [1, 1, 1, 1]
+ selection_sort(array)
+ print(array)
+
+ array = [1, 2, 3, 4]
+ selection_sort(array)
+ print(array)
+
+ array = [4, 3, 2, 1]
+ selection_sort(array)
+ print(array)
+
+ array = [5, 6, -1, 4, 2, 8, 10, 7, 6]
+ selection_sort(array)
+ print(array)