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
+bingo_num = 8                                                   #要找的数
+low = 0     #左边索引
+high = len(num_list)-1                                          #右边索引
+
+while low <= high:                                              #条件循环
+    mid = (low+high) // 2                                       #中间索引
+    guess_num = num_list[mid]                                   #列表的中间索引对应的数给一个变量
+    if guess_num == bingo_num:                                  #猜的=找
+        print("找到了，索引是:",mid)                             #找到
+        break                                                   #跳出
+    elif guess_num < bingo_num:                                 #猜的<找
+        low = mid+1     #变最小
+    elif guess_num > bingo_num:                                 #猜的>找
+        high = mid-1
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