测试输入包含若干测试用例。每个测试用例的第1行包含两个整数 N (N<=100000) 和 C,其中 N 是纪录的条数,C 是指定排序的列号。以下有N行,每行包含一条学生纪录。每条学生纪录由学号(6位数字,同组测试中没有重复的学号)、姓名(不超过8位且不包含空格的字符串)、成绩(闭区间[0, 100]内的整数)组成,每个项目间用1个空格隔开。当读到 N=0 时,全部输入结束,相应的结果不要输出。
对每个测试用例,首先输出1行“Case:”。随后在 N 行中输出按要求排序后的结果,即:当 C=1 时,按学号递增排序;当 C=2时,按姓名的非递减字典序排序;当 C=3 时,按成绩的非递减排序。当若干学生具有相同姓名或者相同成绩时,则按他们的学号递增排序。
3 1 000007 James 85 000010 Amy 90 000001 Zoe 60
Case: 000001 Zoe 60 000007 James 85 000010 Amy 90
import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while(scanner.hasNext()) { int n = scanner.nextInt(); int i = scanner.nextInt(); List<Student> myList = new ArrayList<Student>(); for (int j = 0; j < n; j++) { Student student = new Student(scanner.next(),scanner.next(),scanner.nextInt()); myList.add(student); } if (i == 1) { Collections.sort(myList,Comparator.comparing(Student::getNo)); System.out.println("Case:"); for (Student student : myList) { System.out.println(student.no+" "+student.name+" "+student.grade); } }else if (i == 2) { Collections.sort(myList,Comparator.comparing(Student::getName)); System.out.println("Case:"); for (Student student : myList) { System.out.println(student.no+" "+student.name+" "+student.grade); } }else { Collections.sort(myList,Comparator.comparing(Student::getGrade).thenComparing(Student::getNo)); System.out.println("Case:"); for (Student student : myList) { System.out.println(student.no+" "+student.name+" "+student.grade); } } } } } class Student{ String no; String name; int grade; public Student(String no,String name,int grade) { this.no = no; this.name = name; this.grade = grade; } public void setNo(String no) { this.no = no; } public String getNo() { return no; } public void setGrade(int grade) { this.grade = grade; } public int getGrade() { return grade; } public void setName(String name) { this.name = name; } public String getName() { return name; } }
import java.util.Arrays; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while (scanner.hasNext()) { int n = scanner.nextInt(); int caseNumber = scanner.nextInt(); Student[] students = new Student[n]; for (int i = 0; i < n; i++) { String ids = scanner.next(); int id = Integer.parseInt(ids); students[i] = new Student(ids, id, scanner.next(), scanner.nextInt(), caseNumber); } Arrays.sort(students); System.out.println("Case:"); for (Student student : students) System.out.println(student); } } static class Student implements Comparable<Student> { String ids; Integer id; String name; Integer score; Integer caseNumber; public Student(String ids, Integer id, String name, Integer score, Integer caseNumber) { this.ids = ids; this.id = id; this.name = name; this.score = score; this.caseNumber = caseNumber; } @Override public int compareTo(Student o) { if (caseNumber == 1) return this.id.compareTo(o.id); else if (caseNumber == 2) return this.name.equals(o.name) ? this.id.compareTo(o.id) : this.name.compareTo(o.name); //caseNumber==3 else return this.score.equals(o.score) ? this.id.compareTo(o.id) : this.score.compareTo(o.score); } @Override public String toString() { return ids + " " + name + " " + score; } } }