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]
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
-g=82
-l=0
-h=9
-m=(l+h)//2
-while True:
-    if num_list[m]==g:
-        print('找到了')
-        break
-    elif l>h:
-        print('没找到')
-        break
-    elif g>num_list[m]:
-        l=m+1
-        m=(l+h)//2
-    else:
-        h=m-1
-        m=(l+h)//2
+def bs(a,n):
+    l=0
+    h=len(a)-1
+    m=(l+h)//2
+    while True:
+        if num_list[m]==n:
+            return m
+        elif l>h:
+            break
+        elif n>num_list[m]:
+            l=m+1
+            m=(l+h)//2
+        else:
+            h=m-1
+            m=(l+h)//2
+j=bs(num_list,3)
+print(j)
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