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]
\ No newline at end of file
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+l = 0
+h = len(num_list)-1
+while True:
+    m = (l+h)//2
+    g = num_list[m]
+    if g == 9:
+        print("索引是："+str(m))
+        break
+    elif l > h:
+        print("没有这个数")
+        break
+    elif g > 9:
+        h = m-1
+    else:
+        l = m+1
\ No newline at end of file