2017蓝桥杯兴趣小组（C++/C组）----C语言解题思路和代码

水深无声 2022-04-08 09:44 226阅读 0赞

## 2017蓝桥杯兴趣小组（C++/C组） ##

**------C语言解题思路和代码**

\*\*原题：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…

数据：

A…txt:

12894792, 92774113, 59529208, 22962224, 02991600, 83340521, 87365045,  
40818286, 16400628, 39475245, 55933381, 76940287, 61366748, 95631228,  
17102313, 50682833, 61562613, 87002524, 83062019, 51743442, 61977890,  
32010762, 69680621, 87179571, 81761697, 32364296, 07833271, 36198035,  
26588918, 84046668, 43059468, 73191775, 56794101, 00454780, 11141030,  
10008994, 35072237, 44945158, 53959980, 75758119, 18560273, 35801494,  
42102550, 22496415, 03981786, 34593672, 13074905, 07733442, 42374678,  
23452507, 98586743, 30771281, 17703080, 52123562, 05898131, 56698981,  
90758589, 18238802, 18217979, 04511837, 75682969, 31135682, 55379006,  
42224598, 98263070, 40228312, 28924663, 11580163, 25686441, 45944028,  
96731602, 53675990, 03854194, 14858183, 16866794, 40677007, 73141512,  
32317341, 56641725, 43123040, 15201174, 62389950, 72887083, 76860787,  
61046319, 06923746, 17874548, 46028629, 10577743, 48747364, 05328780,  
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, 09683688, 58218284, 46792829, 97221709, 45286643,  
48158629, 57367208, 26903401, 76900414, 87927040, 09926730, 01508757,  
15101101, 62491840, 43802529,

B.txt:

44894050, 34662733, 44141729, 92774113, 99208727, 91919833, 23727681,  
10003409, 55933381, 54443275, 13584702, 96523685, 50682833, 61562613,  
62380975, 20311684, 93200452, 23101945, 42192880, 28992561, 18460278,  
19186537, 58465301, 01111066, 62680429, 23721241, 20277631, 91708977,  
57514737, 03981786, 81541612, 07346443, 93154608, 19709455, 37446968,  
17703080, 72378958, 66200696, 30610382, 89586343, 33152171, 67040930,  
35696683, 63242065, 99948221, 96233367, 52593493, 98263070, 01418023,  
74816705, 89375940, 58405334, 96731602, 84089545, 16866794, 94737626,  
01673442, 70548494, 13638168, 08163691, 11106566, 64375392, 40267902,  
00897705, 56447313, 54532235, 94738425, 66642634, 83219544, 40546096,  
66924991, 20592606, 96037590, 73434467, 70896866, 91025618, 57892091,  
08487641, 32500082, 84412833, 23311447, 38380409, 79957822, 72971538,  
69645784, 91863314, 73099909, 93209260, 83461794, 81378487, 30423273,  
22233715, 32232841, 26716521, 03511221, 29196547, 58263562, 56233305,  
52547525, 55812835, 87253244, 52484232, 80837360, 94098464, 52028151,  
53267501, 66381929, 84381316, 59788467, 09683688, 67082008, 71605255,  
80654064, 21434307, 45286643, 76556656, 82465821, 57367208, 79218980,  
48460468, 59170479, 46046391, 43043164, 96544490, 83340521, 70837892,  
18926791, 40818286, 28936302, 11489524, 51031183, 73860337, 13241219,  
09025448, 10718828, 76360986, 26031606, 76558053, 97726139, 46473415,  
48406387, 23625539, 86756012, 35164187, 49161302, 78082834, 35072237,  
08602486, 29815841, 56562216, 77684187, 81751704, 20160464, 50407962,  
27786415, 19893526, 00934129, 37759498, 52636463, 25666982, 43262852,  
38393436, 02581136, 29323250, 56950657, 05898131, 95286262, 75574581,  
54057961, 06703896, 90758589, 57782642, 34492535, 41919697, 06395464,  
10993500, 81212949, 34017532, 69569396, 99009936, 57129610, 67401593,  
71044018, 62076698, 29533873, 71936325, 86874388, 26545032, 35695544,  
30433724, 53127345, 72887083, 25390873, 63711546, 06923746, 27783723,  
33199575, 35929698, 16491251, 18276792, 62744775, 92096155, 06336570,  
56141974, 73007273, 31416832, 00171057, 64176982, 46938647, 58460388,  
69972026, 73724304, 27435484, 51568616, 15531822, 47788699, 11818851,  
41594694, 83561325, 43107163, 56965375, 10557343, 26118061, 74650126,  
90076467, 10657376, 49901436, 03425162, 61164599, 15797769, 05427896,  
14444084, 36795868, 18079449, 59653393, 72942548, 06763077, 33895610,  
94892653, 12085268, 65174140, 79567366, 23020126, 74290047, 13498869,  
21696323, 27724594, 54941003, 38229841, 07050068,

C.txt:

13404901, 39952424, 47847739, 94939581, 13809950, 70966043, 11161555,  
17102313, 47079425, 50682833, 74154313, 61562613, 93200452, 37103342,  
18479435, 32502597, 36198035, 54210010, 73191775, 48358178, 85544503,  
05996766, 54651623, 52113220, 27465181, 23871783, 22496415, 54107041,  
65899605, 56528700, 82671109, 61176034, 42374678, 51612628, 63329997,  
56591652, 04552733, 12789324, 89586343, 51935014, 38611966, 43916409,  
70996050, 98263070, 01418023, 65345049, 21734275, 76846198, 71506230,  
00833171, 67128139, 41367555, 64769510, 44010700, 16475199, 93164325,  
09386162, 95324041, 80688223, 67629139, 79552617, 76219736, 50368644,  
45096021, 54972488, 63779011, 28862942, 73145521, 74078605, 66924991,  
12806850, 02171001, 70896866, 73434467, 08487641, 44415025, 32500082,  
84412833, 83896188, 52243759, 49191410, 38744339, 48079796, 44937032,  
06267501, 81866886, 38575984, 25978688, 78974338, 41247821, 12356966,  
64842303, 79127158, 02366944, 68000570, 12426275, 96409230, 00705972,  
08266503, 83820884, 08831807, 43273308, 23216105, 29196547, 95160161,  
05553537, 52182214, 32641346, 91553427, 24436506, 77433749, 01979664,  
52028151, 88985343, 01761499, 76203088, 63237368, 23405334, 59788467,  
09683688, 67755443, 29946533, 12053603, 00437479, 15200030, 45286643,  
93537527, 82465821, 57367208, 53899751, 15354933, 97760830, 68933762,  
80220545, 01892750, 39868288, 21524323, 69716610, 65083815, 78048499,  
03227391, 83340521, 87365045, 71720254, 51031183, 89168555, 08503028,  
37086236, 25103057, 87002524, 22808816, 80928090, 90741678, 15993372,  
99117082, 49938176, 21755083, 86903426, 87830263, 53959980, 75758119,  
59781354, 58679691, 25666982, 56307643, 47180521, 62776522, 78136608,  
44882734, 90758589, 08075999, 66303819, 23480347, 11580163, 87080118,  
18329165, 92514163, 89404632, 92377859, 03912329, 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, 09926730, 27724594, 95148523, 20503000, 64390907, 26006953,  
98116293, 97457666, 29017396, 04634371, 70791589,

**解析：做题以前需要先利用记事本替换功能把数据中的逗号全部替换为空格，把首部为零的数中的第一个零替换成非零的数（或则把所有的零都替换掉，不会影响最终值）**

C代码如下：

#include<stdio.h>
    int main()
    {
    	FILE *fp,*fp1,*fp2;
    	long long arry[400];
    	long long arry1[400];
    	long long arry2[400];
    	long long arry3[400];
    	long long number;
    	int len1=0,len2=0,len3=0,len4=0;
    	int i=0,j=0;
    	int num=0,num1=0;
    	fp=fopen("A.txt","r");//A文件 
    	fp1=fopen("B.txt","r");//B文件 
    	fp2=fopen("C.txt","r");//C文件 
        while(fscanf(fp,"%lld",&number)!=EOF)//把A文件的数存储到arry数组 
        {
        	arry[len1++]=number;	
        }
    	while(fscanf(fp1,"%lld",&number)!=EOF)//把B文件的数存储到arry1数组 
        {
        	arry1[len2++]=number;	
        }
        while(fscanf(fp2,"%lld",&number)!=EOF)//把C文件的数存储到arry2数组 
        {
        	arry2[len3++]=number;	
        }
        
        for(i=0;i<len1;i++)
        {
        	for(j=0;j<len2;j++)
        	{
        		if(arry[i]==arry1[j])
        		{
        			arry3[len4++]=arry[i];//把A,B文件的相同的数存储到arry3数组 
        			num++;//A,B共有个数 
        		}
        	}
        }
        for(i=0;i<len4;i++)
        {
        	for(j=0;j<len3;j++)
        	{
        		if(arry3[i]==arry2[j])
        		{
        			num1++;
        		}
        	}
        }
        printf("%d",num-num1);//属于A，B但不属于C 
    	fclose(fp);
    	return 0;
    }