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]
+zqds = 19
+xs = 0
+ds = len(num_list)-1
+while xs <= ds:
+    zjds = (xs + ds) // 2
+    cds = num_list[zjds]
+    if cds == zqds:
+        print('他在第',zjds + 1,'个')
+        break
+    elif cds < zqds:
+        xs = zjds + 1
+    elif cds > zqds:
+        ds = zjds - 1
+
+    
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