相关题目：
2016年第七届蓝桥杯真题解析JavaB组
2016年第七届蓝桥杯真题解析JavaC组
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2017年第八届蓝桥杯真题解析JavaC组
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A：外星日历
某星系深处发现了文明遗迹。
他们的计数也是用十进制。 他们的文明也有日历。日历只有天数，没有年、月的概念。 有趣的是，他们也使用了类似“星期”的概念， 只不过他们的一个星期包含了9天， 为了方便，这里分别记为: A,B,C…H,I
从一些资料上看到， 他们的23日是星期E 他们的190日是星期A 他们的343251日是星期I
令人兴奋的是，他们居然也预见了“世界末日”的那天， 当然是一个很大很大的数字 651764141421415346185
请你计算一下，这遥远的一天是该文明的星期几？
你需要提交的是一个大写字母，表示该文明的星期几， 不要填写任何多余的内容。
package JC2017;import javax.security.sasl.SaslClient;import java.math.BigInteger;import java.util.Scanner;public class 外星日历 {public static void main(String[] args) {Scanner input=new Scanner(System.in);char []arr={'I','A','B','C','D','E','F','G','H'};BigInteger num=input.nextBigInteger();BigInteger mod=new BigInteger("9");String ans=num.mod(mod).toString();System.out.println(arr[Integer.parseInt(ans)]);}}答案：G
B：兴趣小组
为丰富同学们的业余文化生活，某高校学生会创办了3个兴趣小组 （以下称A组，B组，C组）。 每个小组的学生名单分别在【A.txt】,【B.txt】和【C.txt】中。 每个文件中存储的是学生的学号。
由于工作需要，我们现在想知道： 既参加了A组，又参加了B组，但是没有参加C组的同学一共有多少人？
请你统计该数字并通过浏览器提交答案。
注意：答案是一个整数，不要提交任何多余的内容。
笨笨有话说： 哇塞！数字好多啊！一眼望过去就能发现相同的，好像没什么指望。 不过，可以排序啊，要是每个文件都是有序的，那就好多了。
歪歪有话说： 排什么序啊，这么几行数字对计算机不是太轻松了吗？ 我看着需求怎么和中学学过的集合很像啊…
硬算 package JB2017;public class 日期问题 {public static void main(String[] args) {int[] a = {12894792, 92774113, 59529208, 22962224,2991600, 83340521, 87365045,40818286, 16400628, 39475245, 55933381, 76940287, 61366748, 95631228,17102313, 50682833, 61562613, 87002524, 83062019, 51743442, 61977890,32010762, 69680621, 87179571, 81761697, 32364296,7833271, 36198035,26588918, 84046668, 43059468, 73191775, 56794101,454780, 11141030,10008994, 35072237, 44945158, 53959980, 75758119, 18560273, 35801494,42102550, 22496415,3981786, 34593672, 13074905,7733442, 42374678,23452507, 98586743, 30771281, 17703080, 52123562,5898131, 56698981,90758589, 18238802, 18217979,4511837, 75682969, 31135682, 55379006,42224598, 98263070, 40228312, 28924663, 11580163, 25686441, 45944028,96731602, 53675990,3854194, 14858183, 16866794, 40677007, 73141512,32317341, 56641725, 43123040, 15201174, 62389950, 72887083, 76860787,61046319,6923746, 17874548, 46028629, 10577743, 48747364,5328780,59855415, 60965266, 20592606, 14471207, 70896866, 46938647, 33575820,53426294, 56093931, 51326542, 94050481, 80114017, 33010503, 72971538,22407422, 17305672, 78974338, 93209260, 83461794, 41247821, 26118061,10657376, 42198057, 15338224, 50284714, 32232841, 26716521, 76048344,23676625, 62897700, 69296551, 59653393, 38704390, 48481614, 69782897,26850668, 37471053, 88720989, 51010849, 94951571, 60024611, 29808329,70377786, 13899299,9683688, 58218284, 46792829, 97221709, 45286643,48158629, 57367208, 26903401, 76900414, 87927040,9926730,1508757,15101101, 62491840, 43802529};int[] b = {44894050, 34662733, 44141729, 92774113, 99208727, 91919833, 23727681,10003409, 55933381, 54443275, 13584702, 96523685, 50682833, 61562613,62380975, 20311684, 93200452, 23101945, 42192880, 28992561, 18460278,19186537, 58465301,1111066, 62680429, 23721241, 20277631, 91708977,57514737,3981786, 81541612,7346443, 93154608, 19709455, 37446968,17703080, 72378958, 66200696, 30610382, 89586343, 33152171, 67040930,35696683, 63242065, 99948221, 96233367, 52593493, 98263070,1418023,74816705, 89375940, 58405334, 96731602, 84089545, 16866794, 94737626,1673442, 70548494, 13638168,8163691, 11106566, 64375392, 40267902,897705, 56447313, 54532235, 94738425, 66642634, 83219544, 40546096,66924991, 20592606, 96037590, 73434467, 70896866, 91025618, 57892091,8487641, 32500082, 84412833, 23311447, 38380409, 79957822, 72971538,69645784, 91863314, 73099909, 93209260, 83461794, 81378487, 30423273,22233715, 32232841, 26716521,3511221, 29196547, 58263562, 56233305,52547525, 55812835, 87253244, 52484232, 80837360, 94098464, 52028151,53267501, 66381929, 84381316, 59788467,9683688, 67082008, 71605255,80654064, 21434307, 45286643, 76556656, 82465821, 57367208, 79218980,48460468, 59170479, 46046391, 43043164, 96544490, 83340521, 70837892,18926791, 40818286, 28936302, 11489524, 51031183, 73860337, 13241219,9025448, 10718828, 76360986, 26031606, 76558053, 97726139, 46473415,48406387, 23625539, 86756012, 35164187, 49161302, 78082834, 35072237,8602486, 29815841, 56562216, 77684187, 81751704, 20160464, 50407962,27786415, 19893526,934129, 37759498, 52636463, 25666982, 43262852,38393436,2581136, 29323250, 56950657,5898131, 95286262, 75574581,54057961,6703896, 90758589, 57782642, 34492535, 41919697,6395464,10993500, 81212949, 34017532, 69569396, 99009936, 57129610, 67401593,71044018, 62076698, 29533873, 71936325, 86874388, 26545032, 35695544,30433724, 53127345, 72887083, 25390873, 63711546,6923746, 27783723,33199575, 35929698, 16491251, 18276792, 62744775, 92096155,6336570,56141974, 73007273, 31416832,0171057, 64176982, 46938647, 58460388,69972026, 73724304, 27435484, 51568616, 15531822, 47788699, 11818851,41594694, 83561325, 43107163, 56965375, 10557343, 26118061, 74650126,90076467, 10657376, 49901436,3425162, 61164599, 15797769,5427896,14444084, 36795868, 18079449, 59653393, 72942548,6763077, 33895610,94892653, 12085268, 65174140, 79567366, 23020126, 74290047, 13498869,21696323, 27724594, 54941003, 38229841,7050068};int[] c = {13404901, 39952424, 47847739, 94939581, 13809950, 70966043, 11161555,17102313, 47079425, 50682833, 74154313, 61562613, 93200452, 37103342,18479435, 32502597, 36198035, 54210010, 73191775, 48358178, 85544503,5996766, 54651623, 52113220, 27465181, 23871783, 22496415, 54107041,65899605, 56528700, 82671109, 61176034, 42374678, 51612628, 63329997,56591652,4552733, 12789324, 89586343, 51935014, 38611966, 43916409,70996050, 98263070,1418023, 65345049, 21734275, 76846198, 71506230,833171, 67128139, 41367555, 64769510, 44010700, 16475199, 93164325,9386162, 95324041, 80688223, 67629139, 79552617, 76219736, 50368644,45096021, 54972488, 63779011, 28862942, 73145521, 74078605, 66924991,12806850,2171001, 70896866, 73434467,8487641, 44415025, 32500082,84412833, 83896188, 52243759, 49191410, 38744339, 48079796, 44937032,6267501, 81866886, 38575984, 25978688, 78974338, 41247821, 12356966,64842303, 79127158,2366944, 68000570, 12426275, 96409230,705972,8266503, 83820884,8831807, 43273308, 23216105, 29196547, 95160161,5553537, 52182214, 32641346, 91553427, 24436506, 77433749,1979664,52028151, 88985343,1761499, 76203088, 63237368, 23405334, 59788467,9683688, 67755443, 29946533, 12053603,437479, 15200030, 45286643,93537527, 82465821, 57367208, 53899751, 15354933, 97760830, 68933762,80220545,1892750, 39868288, 21524323, 69716610, 65083815, 78048499,3227391, 83340521, 87365045, 71720254, 51031183, 89168555,8503028,37086236, 25103057, 87002524, 22808816, 80928090, 90741678, 15993372,99117082, 49938176, 21755083, 86903426, 87830263, 53959980, 75758119,59781354, 58679691, 25666982, 56307643, 47180521, 62776522, 78136608,44882734, 90758589,8075999, 66303819, 23480347, 11580163, 87080118,18329165, 92514163, 89404632, 92377859,3912329, 17499963, 59699979,79876366, 63894807, 37857001, 86003935, 90087123, 29433345, 80298948,61531153, 61046319, 37839841, 19421134, 48747364, 35196916, 62484573,59907079, 36845702, 21631642, 72739317, 26283700, 80114017, 76639390,29154110, 35159758, 47788699, 11818851, 56520669, 36396767, 36031167,83817428, 10657376, 90076467, 14676452, 11024560, 16327605, 76048344,14444084, 95452011, 99612346, 65172562, 84813675, 88618282, 38704390,27998014, 63859011, 33787505, 60024611, 16229880, 13899299, 35240335,29173227, 45036451, 66177893, 82658333, 43100730, 44520187, 74290047,85013538,9926730, 27724594, 95148523, 20503000, 64390907, 26006953,98116293, 97457666, 29017396,4634371, 70791589};int count=0;for(int i=0;i