【PAT】【Advanced Level】1028. List Sorting (25)

1028. List Sorting (25)

时间限制

200 ms

内存限制

65536 kB

代码长度限制

16000 B

判题程序

Standard

作者

CHEN, Yue

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 1000007 James 85000010 Amy 90000001 Zoe 60

Sample Output 1

000001 Zoe 60000007 James 85000010 Amy 90

Sample Input 2

4 2000007 James 85000010 Amy 90000001 Zoe 60000002 James 98

Sample Output 2

000010 Amy 90000002 James 98000007 James 85000001 Zoe 60

Sample Input 3

4 3000007 James 85000010 Amy 90000001 Zoe 60000002 James 90

Sample Output 3

000001 Zoe 60000007 James 85000002 James 90000010 Amy 90

原题链接：

https://www.patest.cn/contests/pat-a-practise/1028

思路：

sort配合不同的cmp函数

优化：

正常做（string，cin/cout）最后一个数据点超时

优化输入输出为scanf/printf

相应的string改为char[]，同时比较函数为strcmp

最后将学号储存为整数，输出时注意位数

CODE：

#include<iostream>#include<cstring>#include<string>#include<cstdio>#include<algorithm>#define N 100010using namespace std;typedef struct S{    int sno;    char name[100];    int gra;};S stu[N];bool cmp1(S a, S b){    return a.sno<b.sno;}bool cmp2(S a, S b){    if (strcmp(a.name,b.name)==0)        return a.sno<b.sno;    else        return strcmp(a.name,b.name)<0;}bool cmp3(S a, S b){    if (a.gra==b.gra)        return a.sno<b.sno;    else        return a.gra<b.gra;}int main(){    int n,c;    cin>>n>>c;    for(int i=0;i<n;i++)    {        scanf("%d %s %d",&stu[i].sno,&stu[i].name,&stu[i].gra);    }    if (c==1)    {        sort(stu,stu+n,cmp1);    }    else if (c==2)    {        sort(stu,stu+n,cmp2);    }    else    {        sort(stu,stu+n,cmp3);    }    for (int i=0;i<n;i++)    {        printf("%06d %s %d\n",stu[i].sno,stu[i].name,stu[i].gra);    }    return 0;}