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]
+flag=8
+minIndex=0
+maxIndex=len(num_list)-1
+while True:
+    mid=(minIndex+maxIndex)//2
+    if num_list[mid]==flag:
+        print ("中了!!是第"+str(mid)+"个")
+        break
+    elif num_list[mid]>flag:
+        maxIndex=mid-1
+    elif num_list[mid]<flag:
+        minIndex=mid+1
+    elif maxIndex<minIndex:
+        print("NO FOUND!!!")
+        break
+ #     傻     傻             
+ #   傻     傻
+ # 傻 傻    傻傻傻傻傻
+ #傻  傻    傻  傻  傻
+ #    傻  傻傻傻傻傻傻
+#     傻    傻     傻
+#     傻      傻 傻
+#     傻    傻   傻傻
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