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]
-low=0
-high=len(num_list)-1
-num=20
-while low<=high:
-    mid=(low+high)//2
-    s=num_list[mid]
-    if s<num:
-        low=mid+1
-    if s>num:
-        high=mid-1
-    if s==num:
-        print(mid)
-        break
 
+def binary_search(num_list,num):
+    low=0
+    high=len(num_list)-1
+    while low<=high:
+        mid=(low+high)//2
+        s=num_list[mid]
+        if s<num:
+            low=mid+1
+        if s>num:
+            high=mid-1
+        if s==num:
+            return mid
+a=binary_search(num_list,17)
+print(a)