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]
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+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+high=len(num_list)-1
+while True:
+    mid=(low+high)//2
+    a=num_list[mid]
+    if a==20:
+        print("找到了")
+        print()
+        break
+    elif a<20:
+        low=mid+1
+    else:
+        high=mid-1
+    if high<low:
+        print("没有")
+        break
\ No newline at end of file