Codeforces Round #598 (Div. 3) F. Equalizing Two Strings 构造
F. Equalizing Two Strings
You are given two strings s and t both of length n and both consisting of lowercase Latin letters.
In one move, you can choose any length len from 1 to n and perform the following operation:
Choose any contiguous substring of the string s of length len and reverse it;
at the same time choose any contiguous substring of the string t of length len and reverse it as well.
Note that during one move you reverse exactly one substring of the string s and exactly one substring of the string t.
Also note that borders of substrings you reverse in s and in t can be different, the only restriction is that you reverse the substrings of equal length. For example, if len=3 and n=5, you can reverse s[1…3] and t[3…5], s[2…4] and t[2…4], but not s[1…3] and t[1…2].
Your task is to say if it is possible to make strings s and t equal after some (possibly, empty) sequence of moves.
You have to answer q independent test cases.
Input
The first line of the input contains one integer q (1≤q≤104) — the number of test cases. Then q test cases follow.
The first line of the test case contains one integer n (1≤n≤2⋅105) — the length of s and t.
The second line of the test case contains one string s consisting of n lowercase Latin letters.
The third line of the test case contains one string t consisting of n lowercase Latin letters.
It is guaranteed that the sum of n over all test cases does not exceed 2⋅105 (∑n≤2⋅105).
Output
For each test case, print the answer on it — "YES" (without quotes) if it is possible to make strings s and t equal after some (possibly, empty) sequence of moves and "NO" otherwise.
Example
input
4
4
abcd
abdc
5
ababa
baaba
4
asdf
asdg
4
abcd
badc
output
NO
YES
NO
YES
题意
现在给你两个字符串,你可以进行若干次操作。
每次操作需要在每个字符串都选择出长度为len的一个区间,然后将这个区间的字符都进行翻转。
问你进行若干次操作后,这俩字符串能变成一样的吗?
题解
按照这个顺序进行判断:
- 如果两个字符串存在不同的字符,那么肯定是NO
- 如果某个字符串存在两个相同的字符,那么一定是YES,因为可以就在这两个字符中进行无限次的翻转
- 如果两个字符串的逆的奇偶性相同,那么一定是YES
第三个怎么理解呢?在判断1和2之后,我们得到的一定是一个排列,问题就变成你可以翻转若干次,两个排列能否相同。
我们考虑我们同时翻转相同长度的,我们排列的逆一定会发生奇偶性的变化,那么如果一开始奇偶性就不同,那么不管怎么翻转,都不会相同。
代码
#include<bits/stdc++.h>
using namespace std;
int n;
string s1,s2,S1,S2;
int Count(string s){
int num=0;
for(int i=0;i<s.size();i++){
for(int j=0;j<i;j++){
if(s[j]>s[i])
num++;
}
}
return num;
}
void solve(){
cin>>n>>S1>>S2;
s1=S1;s2=S2;
sort(s1.begin(),s1.end());
sort(s2.begin(),s2.end());
for(int i=0;i<n;i++){
if(s1[i]!=s2[i]){
puts("NO");
return;
}
}
for(int i=1;i<n;i++){
if(s1[i]==s1[i-1]){
puts("YES");
return;
}
if(s2[i]==s2[i-1]){
puts("YES");
return;
}
}
if(Count(S1)%2==Count(S2)%2){
puts("YES");
}else{
puts("NO");
}
return;
}
int main(){
int t;
scanf("%d",&t);
while(t--)solve();
}
Codeforces Round #598 (Div. 3) F. Equalizing Two Strings 构造的更多相关文章
- Codeforces Round #598 (Div. 3) F. Equalizing Two Strings
You are given two strings ss and tt both of length nn and both consisting of lowercase Latin letters ...
- Codeforces Round #582 (Div. 3) E. Two Small Strings (构造,思维,全排列)
题意:给你两个长度为\(2\)的字符串\(s\)和\(t\),你需要构造一个长度为\(3n\)的字符串,满足:含有\(n\)个\(a\),\(n\)个\(b\),\(n\)个\(c\),并且\(s\) ...
- Codeforces Round #485 (Div. 2) F. AND Graph
Codeforces Round #485 (Div. 2) F. AND Graph 题目连接: http://codeforces.com/contest/987/problem/F Descri ...
- Codeforces Round #486 (Div. 3) F. Rain and Umbrellas
Codeforces Round #486 (Div. 3) F. Rain and Umbrellas 题目连接: http://codeforces.com/group/T0ITBvoeEx/co ...
- Codeforces Round #501 (Div. 3) F. Bracket Substring
题目链接 Codeforces Round #501 (Div. 3) F. Bracket Substring 题解 官方题解 http://codeforces.com/blog/entry/60 ...
- Codeforces Round #499 (Div. 1) F. Tree
Codeforces Round #499 (Div. 1) F. Tree 题目链接 \(\rm CodeForces\):https://codeforces.com/contest/1010/p ...
- Codeforces Round #598 (Div. 3)- E. Yet Another Division Into Teams - 动态规划
Codeforces Round #598 (Div. 3)- E. Yet Another Division Into Teams - 动态规划 [Problem Description] 给你\( ...
- 水题 Codeforces Round #302 (Div. 2) A Set of Strings
题目传送门 /* 题意:一个字符串分割成k段,每段开头字母不相同 水题:记录每个字母出现的次数,每一次分割把首字母的次数降为0,最后一段直接全部输出 */ #include <cstdio> ...
- Codeforces Round #598 (Div. 3)
传送门 A. Payment Without Change 签到. Code /* * Author: heyuhhh * Created Time: 2019/11/4 21:19:19 */ #i ...
随机推荐
- 通过pipeline实现jenkins的ci/cd功能
pipeline是基于groove进行实现的,不过从jenkins官方的说明中,pipeline分为脚本式和声明式,参见链接.经过对两种的比较,个人比较偏向脚本式的方法.也就是 Jenkinsfile ...
- Git 自救指南
Git 虽然因其分布式管理方式,不完全依赖网络,良好的分支策略,容易部署等优点,已经成为最受欢迎的源代码管理方式.但是一分耕耘一分收获,如果想更好地掌握 git,需要付出大量的学习成本.即使在各种 G ...
- How To Convert A Partitioned Table To A Non-Partitioned Table Using DataPump In 11g (Doc ID 1276049.1)
How To Convert A Partitioned Table To A Non-Partitioned Table Using DataPump In 11g (Doc ID 1276049. ...
- Linux_更改时区和利用Crontab同步时间
一.更改时区 cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime 二.Crontab时间同步 crontab -e #crontab编辑 */5 ...
- 《Web Development with Go》JWT认证满意版
这个比昨晚的要满意, 认证放到中间件那里了. Mux使用的是gorilla, 中间件使用的是negroni, 启动是用的negroni.classic方法. package main import ( ...
- Django django-cors-headers实现防跨域
安装 pip install django-cors-headers 注册应用 INSTALLED_APPS = ( ... 'corsheaders', ... ) 中间层设置 MIDDLEWARE ...
- B站弹幕爬取 / jieba分词 - 全站第一的视频弹幕都在说什么?
前言 本次爬取的视频av号为75993929(11月21的b站榜首),讲的是关于动漫革命机,这是一部超魔幻现实主义动漫(滑稽),有兴趣的可以亲身去感受一下这部魔幻大作. 准备工作 B站弹幕的爬取的接口 ...
- Oracle数据库的sql语句性能优化
在应用系统开发初期,由于开发数据库数据比较少,对于查询sql语句,复杂试图的编写等体会不出sql语句各种写法的性能优劣,但是如果将应用系统提交实际应用后,随着数据库中数据的增加,系统的响应速度就成为目 ...
- 解决RubyMine中puts中文显示乱码的问题
一个简单的ruby代码,puts一个中文,显示乱码 # -*- coding: utf-8 -*- puts "你好" require_relative 'calc.rb' # r ...
- Asp .Net Core Excel导入和导出
ASP .Net Core使用EPPlus实现Api导入导出,这里使用是EPPlus 4.5.2.1版本,.Net Core 2.2.在linux上运行的时候需要安装libgdiplus . 下面我们 ...