Update 20231213_01.md

Author: digoal

202312/20231213_01.md

@@ -132,7 +132,92 @@ postgres=# select solve_24_game(1,6,7,12);
  12+7-1+6  
  12+7+6-1  
 (18 rows)  
-```  
+```
+  
+补充支持括号的函数:  
+```
+postgres=# CREATE OR REPLACE FUNCTION solve_24_game(num1 INTEGER, num2 INTEGER, num3 INTEGER, num4 INTEGER)
+  RETURNS SETOF TEXT AS $$
+import itertools
+
+def solve_24_game(num1, num2, num3, num4):
+    nums = [num1, num2, num3, num4]
+    operators = ['+', '-', '*', '/']
+    perms = itertools.permutations(nums)
+    for perm in perms:
+        for ops in itertools.product(operators, repeat=3):
+            expression = "(({0}{4}{1}){5}{2}){6}{3}".format(*perm, *ops)
+            try:
+                result = eval(expression)
+                if result == 24:
+                    yield expression
+            except ZeroDivisionError:
+                continue
+  
+    return
+
+return solve_24_game(num1, num2, num3, num4)
+$$ LANGUAGE plpython3u;
+CREATE FUNCTION
+postgres=# select (1,2,3,4);
+    row    
+-----------
+ (1,2,3,4)
+(1 row)
+
+postgres=# select solve_24_game(1,2,3,4);
+ solve_24_game 
+---------------
+ ((1+2)+3)*4
+ ((1*2)*3)*4
+ ((1*2)*4)*3
+ ((1+3)+2)*4
+ ((1*3)*2)*4
+ ((1*3)*4)*2
+ ((1*4)*2)*3
+ ((1*4)*3)*2
+ ((2+1)+3)*4
+ ((2*1)*3)*4
+ ((2/1)*3)*4
+ ((2*1)*4)*3
+ ((2/1)*4)*3
+ ((2+3)+1)*4
+ ((2*3)*1)*4
+ ((2*3)/1)*4
+ ((2*3)*4)*1
+ ((2*3)*4)/1
+ ((2*4)*1)*3
+ ((2*4)/1)*3
+ ((2*4)*3)*1
+ ((2*4)*3)/1
+ ((3+1)+2)*4
+ ((3*1)*2)*4
+ ((3/1)*2)*4
+ ((3*1)*4)*2
+ ((3/1)*4)*2
+ ((3+2)+1)*4
+ ((3*2)*1)*4
+ ((3*2)/1)*4
+ ((3*2)*4)*1
+ ((3*2)*4)/1
+ ((3*4)*1)*2
+ ((3*4)/1)*2
+ ((3*4)*2)*1
+ ((3*4)*2)/1
+ ((4*1)*2)*3
+ ((4/1)*2)*3
+ ((4*1)*3)*2
+ ((4/1)*3)*2
+ ((4*2)*1)*3
+ ((4*2)/1)*3
+ ((4*2)*3)*1
+ ((4*2)*3)/1
+ ((4*3)*1)*2
+ ((4*3)/1)*2
+ ((4*3)*2)*1
+ ((4*3)*2)/1
+(48 rows)
+```
 
 后面又有拿Oracle SQL来战的林春老师, 以及那CTE语法来战的陈刚老师, 可距离德哥给出plpython函数已经半小时过去了, 好了游戏结束.