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
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+
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+def found(num2,num_list):
+    low=0
+    high=len(num_list)-1
+    while low<=high:
+        mid=(low+high)//2
+        if num2 == num_list[mid]:
+            return mid
+            break
+        elif num2 < num_list[mid]:
+            high = mid -1
+        else:
+            low = mid + 1
+    return None
+print(found(4,[1, 3, 5, 8, 11, 15, 17, 18, 20, 21]))
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