PAT甲级 1028. List Sorting (25)

题目：

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

思路：

这个是排序函数的重写，但要注意不要用cin和cout，需要用scanf和printf，否则会超时。

代码：

#include<iostream>#include<string>#include<vector>#include<algorithm>#include<stdio.h>#include<string.h>using namespace std;struct stu{int id;char name[9]; //字符串不超过8个字母int grade;};bool comp1(const stu &s1, const stu &s2){return s1.id < s2.id;}bool comp2(const stu &s1, const stu &s2){if (strcmp(s1.name,s2.name)!=0){if (strcmp(s1.name, s2.name) < 0)return true;elsereturn false;}else{return s1.id < s2.id;}}bool comp3(const stu &s1, const stu &s2){if (s1.grade != s2.grade){return s1.grade < s2.grade;}else{return s1.id < s2.id;}}int main(){int N,C;cin >> N >> C;int i;//inputvector<stu> S(N);for (i = 0; i < N; ++i){scanf("%d%s%d", &(S[i].id), S[i].name, &(S[i].grade));}//sortswitch (C){case 1:{sort(S.begin(),S.end(),comp1);break;}case 2:{sort(S.begin(), S.end(), comp2);break;}case 3:{sort(S.begin(), S.end(), comp3);break;}}//outputfor (i = 0; i < N; ++i){printf("%06d %s %d\n",(S[i].id),S[i].name,(S[i].grade));}system("pause");return 0;}