PAT 1028 List Sorting [排序]

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

Input Specification:

Each input file contains one test case. For each case, the first line contains two integers N (≤105) 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 Specification:

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

-------------------------------我是题目和代码的分割线-------------------------------

#include<cstdio>
#include<algorithm>
#include<string.h>

using namespace std;

struct student
{
	char id[7],sname[8];
	int grade;
}stu[100005];

bool cmp1(student a,student b)
{
	return strcmp(a.id,b.id)<0;
}

//注意一下字符类型不能直接比大小 用strcmp 
bool cmp2(student a,student b)
{
	if(strcmp(a.sname,b.sname)!=0) return strcmp(a.sname,b.sname)<0;
	return strcmp(a.id,b.id)<0;
}

bool cmp3(student a,student b)
{
	if(a.grade!=b.grade) return a.grade<b.grade;
	return strcmp(a.id,b.id)<0;
}

int main()
{
	int n,c,i;
	scanf("%d%d",&n,&c);
	for(i=0;i<n;i++)
		scanf("%s%s%d",stu[i].id,stu[i].sname,&stu[i].grade);
	if(c==1) sort(stu,stu+n,cmp1);
	if(c==2) sort(stu,stu+n,cmp2);
	if(c==3) sort(stu,stu+n,cmp3);
	for(i=0;i<n;i++)
		printf("%s %s %d\n",stu[i].id,stu[i].sname,stu[i].grade);
}