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]
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+num_list = [1, 3, 5, 8 , 9, 11, 15, 17, 18, 20, 21]
+a=0
+b=len(num_list)-1
+c=(a+b)//2
+while True:
+    if num_list[c] > 20:
+        b=c
+        c=(a+b)//2
+    elif num_list[c] < 20:
+        a=c
+        c=(a+b)//2
+    else:
+        print("找到了,索引值是"+str(c))
+        break      
+# if num_list[c] < 9:
+#     a=c
+#     c=(a+b)//2
+# if num_list[c] < 9:
+#     a=c
+#     c=(a+b)//2
+# if num_list[c] == 9:
+#     print("找到了")
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