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浙江大学学报(理学版)  2024, Vol. 51 Issue (2): 178-185    DOI: 10.3785/j.issn.1008-9497.2024.02.006
数学与计算机科学     
最省刻度尺设计的组合差集递推算法
唐保祥1(),任韩2
1.天水师范学院 数学与统计学院,甘肃 天水 741001
2.华东师范大学 数学科学学院,上海 200062
A recursive algorithm of combinatorial difference set design for least scale number on ruler
Baoxiang TANG1(),Han REN2
1.School of Mathematics and Statistics,Tianshui Normal University,Tianshui 741001,Gansu Province,China
2.School of Mathematics Sciences,East China Normal University,Shanghai 200062,China
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摘要:

在长度为nn≥2为正整数)的直尺上最少刻多少个刻度就能度量1到n的所有长度,这便是至今未解决的最省刻度尺问题。阐明了最省刻度尺与极小优美图之间的关系,给出了计算最省刻度尺的所有最省刻度值的组合差集递推算法,得到长度为3~40的最省刻度尺的所有最省刻度值,同时,结合图论模型,给出了长度为41~82的最省刻度尺的最省刻度值。

关键词: 最省刻度尺优美标号极小优美图优美标号算法组合差集递推算法    
Abstract:

For a positive integer n≥2, what is the minimum number of ticks to be engraved on an unscaled ruler of length n to measure all lengths from 1 to n. This is an unsolved problem of ruler with least number of scales. This paper clarifies the relationship between ruler with the least number of scales and the minimal graceful graph, and a combined difference recursive algorithm for calculating all the least scale values of ruler with the least number of scales is given. This algorithm calculates that the length is 3 to all the minimum scale values of the most scale-saving ruler of 40, and combined with the graph theory model, the minimum scale values of ruler with least number of scales with lengths from 41 to 82 are given.

Key words: ruler with least number of scales    graceful labeling    minimal graceful graph    graceful labeling algorithm    combinatorial difference recursive algorithm
收稿日期: 2022-07-04 出版日期: 2024-03-08
CLC:  O 157  
基金资助: 国家自然科学基金资助项目(11171114)
作者简介: 唐保祥(1961—),ORCID:https://orcid.org/0000-0002-1631-1482,男,本科,教授,主要从事图论与组合数学研究,E-mail:zhangmingtnx0618@sina.com.
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引用本文:

唐保祥,任韩. 最省刻度尺设计的组合差集递推算法[J]. 浙江大学学报(理学版), 2024, 51(2): 178-185.

Baoxiang TANG,Han REN. A recursive algorithm of combinatorial difference set design for least scale number on ruler. Journal of Zhejiang University (Science Edition), 2024, 51(2): 178-185.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2024.02.006        https://www.zjujournals.com/sci/CN/Y2024/V51/I2/178

图1  长度为9的最省刻度尺的4种刻度
图2  9条边的所有极小优美图
(0,1)(1,2)2,33,4n-1,n
0,2(1,3)(2,4)n-2,n
0,3(1,4)n-3,n
0,n-1(1,n
0,n
表1  集合{0,1,2,…,n}的所有二元子集
长度其中的一组最省刻度

每组

中的

刻度数

所有不同的刻度组数长度其中的一组最省刻度

每组

中的

刻度数

所有不同的刻度组数
30,2,332220,4,9,14,19,20,21,22818
40,2,3,443230,2,5,8,12,21,22,2384
50,3,4,544240,6,12,19,20,21,22,23,249944
60,2,5,642250,6,13,20,21,22,23,24,259460
70,4,5,6,7512260,5,11,16,22,23,24,25,269166
80,3,6,7,858270,5,11,17,23,24,25,26,27956
90,3,7,8,954280,2,4,6,7,18,19,37,28912
100,4,7,8,9,10638290,2,5,8,11,15,27,28,2996
110,4,8,9,10,11630300,6,13,18,25,26,27,28,29,30102 036
120,4,9,10,11,12614310,6,13,19,26,27,28,29,30,3110890
130,3,7,11,12,1366320,6,13,20,27,28,29,30,31,3210304
140,5,10,11,12,13,147130330,5,11,17,23,29,30,31,32,3310120
150,5,11,12,13,14,15780340,3,6,10,14,19,31,32,33,341020
160,4,8,13,14,15,16732350,2,8,10,17,19,30,31,34,351010
170,4,9,14,15,16,17712360,1,5,9,16,23,30,33,35,36102
180,6,13,14,15,16,17,188500370,7,15,23,31,32,33,34,35,36,37112 678
190,5,10,15,16,17,18,198326380,6,13,19,26,33,34,35,36,37,3811974
200,5,10,16,17,18,19,208150390,6,13,20,27,34,35,36,37,38,3811362
210,5,11,17,18,19,20,21866400,5,11,16,23,30,36,37,38,39,4011100
表2  长度为3~40的最省刻度尺的最省刻度
图3  图K1,1,m,n 的优美标号θ
xfx)的上下界xfx)的上下界xfx)的上下界xfx)的上下界
64≤f(6)≤4268≤f(26)≤94611≤f(46)≤126612≤f(66)≤15
75≤f(7)≤5278≤f(27)≤94711≤f(47)≤136713≤f(67)≤15
85≤f(8)≤5288≤f(28)≤104811≤f(48)≤136813≤f(68)≤15
95≤f(9)≤5299≤f(29)≤104911≤f(49)≤136913≤f(69)≤15
106≤f(10)≤6309≤f(30)≤105011≤f(50)≤137013≤f(70)≤16
116≤f(11)≤6319≤f(31)≤105111≤f(51)≤137113≤f(71)≤16
126≤f(12)≤6329≤f(32)≤105211≤f(52)≤137213≤f(72)≤16
136≤f(13)≤6339≤f(33)≤105311≤f(53)≤137313≤f(73)≤16
146≤f(14)≤7349≤f(34)≤105411≤f(54)≤147413≤f(74)≤16
156≤f(15)≤7359≤f(35)≤105511≤f(55)≤147513≤f(75)≤16
166≤f(16)≤7369≤f(36)≤105612≤f(56)≤147613≤f(76)≤16
177≤f(17)≤73710≤f(37)≤115712≤f(57)≤147713≤f(77)≤16
187≤f(18)≤83810≤f(38)≤115812≤f(58)≤147813≤f(78)≤16
197≤f(19)≤83910≤f(39)≤115912≤f(59)≤147914≤f(79)≤17
207≤f(20)≤84010≤f(40)≤126012≤f(60)≤148014≤f(80)≤17
218≤f(21)≤84110≤f(41)≤126112≤f(61)≤148114≤f(81)≤17
228≤f(22)≤84210≤f(42)≤126212≤f(62)≤158214≤f(82)≤17
238≤f(23)≤94310≤f(43)≤126312≤f(63)≤15
248≤f(24)≤94410≤f(44)≤126412≤f(64)≤15
258≤f(25)≤94510≤f(45)≤126512≤f(65)≤15
表3  有6~82条边的极小优美图的顶点数f (x)的上下界
直尺长度其中一组包括两端点的最省刻度数值最省刻度数
410,1,4,10,16,22,28,34,36,39,4111
420,1,2,3,19,24,28,32,36,39,4211
430,1,3,6,13,20,27,34,38,42,4311
440,1,2,3,4,10,16,22,28,34,39,4412
450,1,2,3,4,5,12,20,26,33,39,4512
460,6,13,20,27,34,41,42,43,44,45,4612
470,1,2,3,4,10,17,24,31,36,42,4712
480,1,2,3,23,24,29,33,37,41,45,4812
490,1,2,3,24,29,30,34,38,42,46,4912
500,1,3,6,13,20,27,34,41,45,49,5012
510,1,2,3,4,5,6,7,16,26,34,43,5113
520,1,2,3,4,10,17,24,31,36,42,47,5213
530,7,15,23,31,39,47,48,49,50,51,52,5313
540,1,2,3,4,5,6,14,23,32,39,47,5413
550,1,2,3,4,5,12,20,28,36,42,49,5513
560,1,2,3,27,28,33,37,41,45,49,53,5613
570,1,3,6,13,20,27,34,41,48,52,56,5713
580,1,2,3,27,32,36,40,44,48,52,55,5813
590,1,2,3,4,5,12,20,28,36,42,49,55,5914
600,1,2,3,4,10,17,24,30,37,44,49,55,6014
610,1,2,3,4,5,6,14,23,32,39,47,54,6114
620,1,2,3,4,5,6,14,23,31,40,47,55,6214
630,1,2,3,4,5,6,14,23,32,41,48,56,6314
640,1,3,6,13,20,27,34,41,48,55,59,63,6414
650,1,6,14,22,30,38,46,54,56,58,61,63,6514
660,1,2,3,31,36,40,44,48,52,56,60,63,6614
670,1,2,3,4,5,12,19,26,33,40,47,54,61,6715
680,1,2,3,4,10,17,24,31,38,45,52,57,63,6815
690,1,2,5,12,19,26,33,40,47,54,61,63,67,6915
700,1,2,3,4,5,6,14,23,32,41,48,56,63,7015
710,1,3,6,13,20,27,34,41,48,55,62,66,70,7115
720,1,2,6,14,22,30,38,46,54,62,65,69,71,7215
730,1,6,14,22,30,38,46,54,62,64,66,69,71,7315
740,1,2,3,35,40,44,48,52,56,60,64,68,71,7415
750,1,2,3,4,10,17,24,31,38,45,52,59,64,70,7516
760,1,2,5,12,19,26,33,40,47,54,61,68,70,74,7616
770,1,2,3,4,5,6,14,22,30,38,46,54,62,70,7716
780,1,3,6,13,20,27,34,41,48,55,62,69,73,77,7816
790,1,2,3,4,5,12,20,28,36,44,52,60,66,73,7916
800,1,2,3,4,5,6,14,23,32,40,49,58,65,73,8016
810,1,2,3,4,5,6,7,16,26,36,46,56,64,73,8116
820,1,2,3,39,44,48,52,56,60,64,68,72,76,79,8216
表4  长度为41~82的最省刻度尺的一组最省刻度值
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