Is it rated?

题意翻译

一场Codeforces的比赛,给出n名选手比赛之前和之后的rating,判断本场比赛是否是评级的.众所周知,如果一场比赛里有选手的分数发生了变化,则这场比赛是评级的;如果本场比赛中rating较低的选手排在rating较高的选手前面但是rating没有变化,则该场比赛是不评级的.如果本场比赛是评级的,输出"rated";如果不评级,输出"unrated";无法判断输出"maybe".

题目描述

Is it rated? Here it is. The Ultimate Question of Competitive Programming, Codeforces, and Everything. And you are here to answer it. Another Codeforces round has been conducted. No two participants have the same number of points. For each participant, from the top to the bottom of the standings, their rating before and after the round is known. It's known that if at least one participant's rating has changed, then the round was rated for sure. It's also known that if the round was rated and a participant with lower rating took a better place in the standings than a participant with higher rating, then at least one round participant's rating has changed. In this problem, you should not make any other assumptions about the rating system. Determine if the current round is rated, unrated, or it's impossible to determine whether it is rated of not.

输入输出格式

输入格式

The first line contains a single integer $ n $ ( $ 2<=n<=1000 $ ) — the number of round participants. Each of the next $ n $ lines contains two integers $ a_{i} $ and $ b_{i} $ ( $ 1<=a_{i},b_{i}<=4126 $ ) — the rating of the $ i $ -th participant before and after the round, respectively. The participants are listed in order from the top to the bottom of the standings.

输出格式

If the round is rated for sure, print "rated". If the round is unrated for sure, print "unrated". If it's impossible to determine whether the round is rated or not, print "maybe".

输入输出样例

输入样例 #1

6
3060 3060
2194 2194
2876 2903
2624 2624
3007 2991
2884 2884

输出样例 #1

rated

输入样例 #2

4
1500 1500
1300 1300
1200 1200
1400 1400

输出样例 #2

unrated

输入样例 #3

5
3123 3123
2777 2777
2246 2246
2246 2246
1699 1699

输出样例 #3

maybe

说明

In the first example, the ratings of the participants in the third and fifth places have changed, therefore, the round was rated. In the second example, no one's rating has changed, but the participant in the second place has lower rating than the participant in the fourth place. Therefore, if the round was rated, someone's rating would've changed for sure. In the third example, no one's rating has changed, and the participants took places in non-increasing order of their rating. Therefore, it's impossible to determine whether the round is rated or not.