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]
\ No newline at end of file
+num = 20
+low = 0
+high = len(num_list)-1
+
+while high >= low:
+    mid = (low + high)//2 
+
+    guess = num_list[mid]
+    if guess == num:
+        print("找到了")
+        print(mid)
+        break
+    elif guess < num:
+        low = mid+1
+    elif guess > num:
+        high = mid-1
+if high < low:
+    print("没有这个数")
+    
\ No newline at end of file