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【培优讲义专题06:数列奇偶性问题】

  • 2026-11-03 04:04:00
【培优讲义专题06:数列奇偶性问题】
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解法1:（奇偶讨论）
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解法2:（待定系数构造）
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解：（奇偶讨论）
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  3. 缓存信息 : 0 reads,0 writes
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  1. CONNECT:[ UseTime:0.000588s ] mysql:host=172.18.0.4;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000796s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000359s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000367s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.000285s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000663s ]
  8. SELECT * FROM `article` WHERE `id` = 464361 LIMIT 1 [ RunTime:0.000354s ]
  9. UPDATE `article` SET `lasttime` = 1794000171 WHERE `id` = 464361 [ RunTime:0.001230s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000301s ]
  11. SELECT * FROM `article` WHERE `id` < 464361 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000399s ]
  12. SELECT * FROM `article` WHERE `id` > 464361 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000363s ]
  13. SELECT * FROM `article` WHERE `id` < 464361 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000694s ]
  14. SELECT * FROM `article` WHERE `id` < 464361 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000501s ]
  15. SELECT * FROM `article` WHERE `id` < 464361 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000571s ]
0.083843s