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
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low = 0
+high = len(num_list)-1
+a = 20
+while low <= high:
+    mid = (high+low)//2
+    b=num_list[mid]
+    if b == a:
+        print("找到了",mid)
+        break
+    elif b < a:
+        low = mid+1
+    else:
+        high = mid-1
+