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Python枚举法|盈亏问题,新手也能看懂的解题笔记

  • 2026-06-22 02:36:06
Python枚举法|盈亏问题,新手也能看懂的解题笔记

宝子们!今天带大家用Python解决一个超经典的数学题——分苹果问题,全程用「枚举法」,不用复杂公式,新手也能跟着敲代码,轻松get解题逻辑✅

先看题目:一箱苹果,如果每人分5个,则多4个;如果每人分6个,则少3个。求苹果有多少个,人有多少个?

其实这道题不用列复杂方程,枚举法就是最直观的思路——说白了,就是“一个个试”,直到找到符合条件的答案,适合刚学Python的小伙伴练手~

第一步:理清解题逻辑(超简单!)

核心思路:人数肯定是正整数,我们从1个人开始试,依次计算两种分法的苹果数量,只要两种分法的苹果数相等,那就是我们要的答案!

拆解两个条件,帮大家捋清楚:

  • 条件1:每人分5个,多4个 → 苹果数 = 5 × 人数 + 4

  • 条件2:每人分6个,少3个 → 苹果数 = 6 × 人数 - 3

我们要做的,就是找到一个人数,让上面两个算式算出的苹果数一样~

第二步:Python枚举法代码(可直接复制运行)

代码里每一行都加了注释,新手跟着读,就能明白每一步在做什么,复制到Python里直接运行,秒出答案!

# 分苹果问题 - 枚举法解题# 思路:从1个人开始试,直到找到符合条件的人数和苹果数# 初始化人数,从1开始尝试people = 1# 循环遍历,直到找到答案(循环不会无限执行,因为题目有唯一解)while True:    # 按照两种分法,分别计算苹果数量    apple_method1 = 5 * people + 4  # 每人分5个,多4个    apple_method2 = 6 * people - 3  # 每人分6个,少3个    # 判断:如果两种分法的苹果数相等,就是我们要的答案    if apple_method1 == apple_method2:        # 输出结果        print(f"✅ 找到答案啦!")        print(f"人数:{people} 人")        print(f"苹果总数:{apple_method1} 个")        break  # 找到答案,退出循环    # 没找到,人数加1,继续尝试    people += 1

第三步:运行结果&思路总结

运行代码后,会直接输出:

✅ 找到答案啦! 人数:7 人 苹果总数:39 个

简单验证一下:

7个人,每人分5个:5×7+4=39(多4个,符合条件); 7个人,每人分6个:6×7-3=39(少3个,符合条件)。

新手必看小提醒

  • 枚举法的核心就是“逐个尝试”,逻辑简单,不用记数学公式,适合刚学循环的小伙伴练手;

  • 这里用while True循环,但是不用担心无限循环——因为题目有唯一解,找到后会用break退出;

  • 代码可以直接复制到IDLE、PyCharm里运行,有任何报错,大概率是复制时漏了符号,重新复制一遍就好~

今天的枚举法解题笔记就到这里啦✨ 其实很多数学题,用Python枚举法都能轻松解决,新手多练两道,就能掌握循环的用法啦~

如果觉得有用,记得收藏起来,下次遇到类似题目,直接拿出来参考哦!

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  1. CONNECT:[ UseTime:0.000867s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000942s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000344s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000483s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000549s ]
  8. SELECT * FROM `article` WHERE `id` = 493881 LIMIT 1 [ RunTime:0.000447s ]
  9. UPDATE `article` SET `lasttime` = 1783038535 WHERE `id` = 493881 [ RunTime:0.008841s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000380s ]
  11. SELECT * FROM `article` WHERE `id` < 493881 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000700s ]
  12. SELECT * FROM `article` WHERE `id` > 493881 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000373s ]
  13. SELECT * FROM `article` WHERE `id` < 493881 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003811s ]
  14. SELECT * FROM `article` WHERE `id` < 493881 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001046s ]
  15. SELECT * FROM `article` WHERE `id` < 493881 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008339s ]
0.162682s