save project

binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
 # 使用二分查找法，找出9和20在列表里面的索引
+a = 20
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+h = len(num_list) - 1
+l = 0
+
+while l <= h:
+    mid = (h + l) // 2
+    gue = num_list[mid]
+    if gue == a:
+        print("找到了，他的索引是", mid)
+        break
+    elif gue < a:
+        l = mid + 1
+    elif gue > a:
+        h = mid - 1
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