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, 11, 15, 17, 18, 20, 21]
+
+low=0
+high=len(num_list)-1
+while True:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if guess==20:
+        print('找到了'+str(mid))
+        exit()
+    elif guess<20:
+        low=mid+1
+    else:
+        high=mid-1
+
+low2=0
+high2=len(num_list)-1
+while True:
+    zjs=(low2+high2)//2
+    caice=num_list[zjs]
+    if caice==9:
+        print('找到了')
+        exit()
+    elif caice<9:
+        low2=zjs+1
+    else:
+        high2=zjs-1
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