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_20 = 20
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+heaghl=len(num_list)-1
+while low <= heaghl:
+    mid = (low+heaghl) // 2
+    num_20 = num_list[mid]
+    if num_20 == num_list[mid]:
+        print(num_20)
+        break
+    elif num_20 < num_list[mid]:
+        low = mid+1
+    elif num_20>num_list[mid]:
+        heaghl = mid-1
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