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]
+a=9
+high =len(num_list)-1
+low = 0
+while low<=high:
+    mid = (low+high)//2
+    if  a == num_list[mid]:
+        print("找到了")
+        exit()
+    elif num_list[mid] < a:
+        low = mid + 1
+    else :
+        high = mid - 1 
+print("找不到")
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