save project

my_search.py

-import random
+# 使用二分查找法，找出9和20在列表里面的索引
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+testList = [1371, 102841, 1324, 124, 5432, 124, 20, 9]
 
 
-alist = []
-for i in range(1, 101):
-    alist.append(i)
-num = random.choice(alist)
-# 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
 
-def binary_search(alist,num):
+def BubbleSort(varList):
\ No newline at end of file
+    secondList = varList
+    for i in range(0, len(secondList) - 1):
+        for index in range(0, len(secondList) - 1):
+            if secondList[index] > secondList[index + 1]:
+                secondList[index], secondList[index + 1] = secondList[index + 1], secondList[index]
+    return secondList
+
+
+def BinarySearch(findNum, searchList):
+    searchList = BubbleSort(searchList)
+    high = len(searchList) - 1
+    low = 0
+
+    while high >= low:
+        mid = (high + low) // 2
+        num = searchList[mid]
+
+        if num == findNum:
+            return mid
+        elif num >= findNum:
+            high = mid - 1
+        else:
+            low = mid + 1
+
+    return None
+
+print(BinarySearch(9, testList))
+print(BinarySearch(20, testList))