1028. List Sorting (25)

电玩女神 2022-05-31 10:24 156阅读 0赞

Excel can sort records according to any column. Now you are supposed to imitate this function.

**Input**

Each input file contains one test case. For each case, the first line contains two integers N (<=100000) and C, where N is the number of records and C is the column that you are supposed to sort the records with. Then N lines follow, each contains a record of a student. A student's record consists of his or her distinct ID (a 6-digit number), name (a string with no more than 8 characters without space), and grade (an integer between 0 and 100, inclusive).

**Output**

For each test case, output the sorting result in N lines. That is, if C = 1 then the records must be sorted in increasing order according to ID's; if C = 2 then the records must be sorted in non-decreasing order according to names; and if C = 3 then the records must be sorted in non-decreasing order according to grades. If there are several students who have the same name or grade, they must be sorted according to their ID's in increasing order.

**Sample Input 1**

3 1
    000007 James 85
    000010 Amy 90
    000001 Zoe 60

**Sample Output 1**

000001 Zoe 60
    000007 James 85
    000010 Amy 90

**Sample Input 2**

4 2
    000007 James 85
    000010 Amy 90
    000001 Zoe 60
    000002 James 98

**Sample Output 2**

000010 Amy 90
    000002 James 98
    000007 James 85
    000001 Zoe 60

**Sample Input 3**

4 3
    000007 James 85
    000010 Amy 90
    000001 Zoe 60
    000002 James 90

**Sample Output 3**

000001 Zoe 60
    000007 James 85
    000002 James 90
    000010 Amy 90

--------------------

题目大意：

Excel可以根据任何列对记录进行排序。现在你的任务是模仿这个函数。  
输入：  
每个输入文件包含一个测试用例。对于每个测试用例，第一行包含两个整数N(<=100000)和C，N代表记录的数量，C是应该对记录进行排序的列。然后是N行每行包含一个学生记录。一个学生记录包含他或她不同的ID（一个6位数字），姓名（一个不超过8个字符且不包含空格的字符串），和成绩（一个0到100之间的整数）。  
输出：  
对于每个测试用例，输出排序后的N行结果。也就是说，如果C=1，那么记录必须按照ID的增加顺序进行排序；如果C=2，则记录必须按名字的非递减顺序进行排序；如果C=3，则记录必须按照成绩的非递减顺序排序。如果有几个学生有相同的名字或成绩，他们必须按照ID的递增顺序排序。

代码：

#include<stdio.h>
    #include<algorithm>
    #include<vector>
    #include<string.h>
    using namespace std;
    struct student
    {
        char ID[10];
        char name[10];
        int grade;
    };
    vector<student> stu;
    bool cmp1(student a,student b)
    {
        return strcmp(a.ID,b.ID)<0;
    }
    bool cmp2(student a,student b)
    {
        if(strcmp(a.name,b.name)!=0)
            return strcmp(a.name,b.name)<0;
        else
            return strcmp(a.ID,b.ID)<0;
    }
    bool cmp3(student a,student b)
    {
        if(a.grade!=b.grade)
            return a.grade<b.grade;
        else
            return strcmp(a.ID,b.ID)<0;
    }
    int main()
    {
        int i,j,n,m,k,t;
        student temp;
        scanf("%d %d",&n,&k);
        for(i=0;i<n;i++)
        {
            scanf("%s %s %d",temp.ID,temp.name,&temp.grade);
            stu.push_back(temp);
        }
        if(k==1)
        {
            sort(stu.begin(),stu.end(),cmp1);
        }
        else if(k==2)
        {
            sort(stu.begin(),stu.end(),cmp2);
        }
        else if(k==3)
        {
            sort(stu.begin(),stu.end(),cmp3);
        }
        for(i=0;i<stu.size();i++)
        {
            printf("%s %s %d\n",stu[i].ID,stu[i].name,stu[i].grade);
        }
        return 0;
    }