102161: [AtCoder]ABC216 B - Same Name

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
Submit:1 Solved:0

Description

Score : $200$ points

Problem Statement

There are $N$ people. The family name and given name of the $i$-th person $(1 \leq i \leq N)$ are $S_i$ and $T_i$, respectively.

Determine whether there is a pair of people with the same family and given names. In other words, determine whether there is a pair of integers $(i,j)$ such that $1 \leq i \lt j \leq N$, $S_i=S_j$, and $T_i=T_j$.

Constraints

  • $2 \leq N \leq 1000$
  • $N$ is an integer.
  • Each of $S_i$ and $T_i$ is a string of length between $1$ and $10$ (inclusive) consisting of English lowercase letters.

Input

Input is given from Standard Input in the following format:

$N$
$S_1$ $T_1$
$S_2$ $T_2$
$\hspace{0.6cm}\vdots$
$S_N$ $T_N$

Output

If there is a pair of people with the same family and given names, print Yes; otherwise, print No.


Sample Input 1

3
tanaka taro
sato hanako
tanaka taro

Sample Output 1

Yes

The first and third persons have the same family and given names.


Sample Input 2

3
saito ichiro
saito jiro
saito saburo

Sample Output 2

No

No two persons have the same family and given names.


Sample Input 3

4
sypdgidop bkseq
bajsqz hh
ozjekw mcybmtt
qfeysvw dbo

Sample Output 3

No

Input

题意翻译

有 $n$ 个人,每行给出其中一个人的姓名,问有没有重名的。**(只有姓和名都一样才算重名)**

Output

分数:200分 部分 问题描述 有N个人。第i个人(1≤i≤N)的姓氏和名字分别为S_i和T_i。 判断是否存在一对人拥有相同的姓氏和名字。换句话说,判断是否存在一对整数(i,j),满足1≤i<j≤N,S_i=S_j和T_i=T_j。 部分 约束 * 2≤N≤1000 * N为整数。 * 每个S_i和T_i都是由小写英文字母组成的长度在1到10(含)之间的字符串。 部分 输入 输入按照以下格式从标准输入给出: N S_1 T_1 S_2 T_2 …… S_N T_N 部分 输出 如果存在一对人拥有相同的姓氏和名字,输出Yes;否则,输出No。 部分 样例输入1 3 tanaka taro sato hanako tanaka taro 部分 样例输出1 Yes 第一个人和第三个人拥有相同的姓氏和名字。 部分 样例输入2 3 saito ichiro saito jiro saito saburo 部分 样例输出2 No 没有两个人拥有相同的姓氏和名字。 部分 样例输入3 4 sypdgidop bkseq bajsqz hh ozjekw mcybmtt qfeysvw dbo 部分 样例输出3 No

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