# 题目

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.

# 题解

• 就排序呗，还能咋地

## 数据结构

• records 记录所有数据，是一个列表（动态数组）
• 表示一个record时，c++使用了结构体而Python使用了列表

## 算法

• 排序就调用内置函数就行了。快且方便。