auto save

binary_search.py

@@ -2,30 +2,27 @@
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 low=0
 low=0
 high=len(num_list)-1
 high=len(num_list)-1
-while true:
+while True:
     mid=(low+high)//2
     mid=(low+high)//2
     guess=num_list[mid]
     guess=num_list[mid]
     if guess==9:
     if guess==9:
         print("找到9的索引了："+str(num_list[mid]))
         print("找到9的索引了："+str(num_list[mid]))
         break
         break
-    elif guess>9:
+    elif guess<9:
         low=mid+1
         low=mid+1
     else:
     else:
         high=mid-1
         high=mid-1
-    if high>low:
+    if high<low:
         print("没找到9")
         print("没找到9")
         break
         break
-    
-while true:
+high=9
+while low<=high:
     mid=(low+high)//2
     mid=(low+high)//2
     guess=num_list[mid]
     guess=num_list[mid]
     if guess==20:
     if guess==20:
-        print("找到20的索引了："+str(num_list[mid]))
+        print("找到20的索引了："+str(mid))
         break
         break
-    elif guess>20:
+    elif guess<20:
         low=mid+1
         low=mid+1
-    else:
+    elif guess>20:
         high=mid-1
         high=mid-1
-    if high>low:
-        print("没找到20")
-        break
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