Codeforces Round #327 (Div. 2) (B. Rebranding 字符串的操作)

分类： 模拟 CF2015-10-26
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[align=center]B. Rebranding[/align]
[align=center]time limit per test[/align]
[align=center]2 seconds[/align]
[align=center]memory limit per test[/align]
[align=center]256 megabytes[/align]
[align=center]input[/align]
[align=center]standard input[/align]
[align=center]output[/align]
[align=center]standard output[/align]

The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both
for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name.

For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes
the newest version of the name and replaces all the letters xi by yi,
and all the letters yi by xi.
This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides
with yi. The version of the name received after the work of the last designer becomes the new name of the corporation.

Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive.

Satisfy Arkady's curiosity and tell him the final version of the name.

Input

The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively.

The second line consists of n lowercase English letters and represents the original name of the corporation.

Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi.

Output

Print the new name of the corporation.

Sample test(s)

Input

6 1
police
p m

Output

molice

Input

11 6
abacabadaba
a b
b c
a d
e g
f a
b b

Output

cdcbcdcfcdc

Note

In the second sample the name of the corporation consecutively changes as follows:













题意：给出一个字符串，然后给出一系列的操作，把x与y字母交换

思路：利用一个数组存储26个字母,然后就在这个数组上交换。输出的时候直接替换

[cpp] view
plaincopyprint?

#include<bits/stdc++.h>

using namespace std;

const int maxn=200011;

const int inf=1<<27;

#define LL long long

#define P pair<int,int>

#define pb push_back

#define cl(a,b) memset(a,b,sizeof(a));

char s[maxn];

int op[27];

int main(){

int n,m;

while(~scanf("%d%d",&n,&m)){

scanf("%s",s);

cl(mp,0);

for(int i=0;i<27;i++)op[i]=i;

for(int i=0;i<m;i++){

char a[2],b[2];

scanf("%s%s",a,b);

swap(op[a[0]-'a'],op[b[0]-'a']);

}

for(int i=0;i<n;i++){

for(int j=0;j<27;j++)if(op[j]==s[i]-'a'){

printf("%c",j+'a');

}

}

printf("\n");

}