b772. 50010. Word Editor - 高中生程式解題系統

內容

Write a program to edit a word. First you will be given a word consisting of lower letters. Each line afterward is a command. The commands are as follow.

replace x y
Both $x$ and $y$ are character. You need to replace all occurrence of $x$ by $y$.
remove x
Remove all occurrence of $x$.
addhead x
Add a character $x$ at the beginning of the word.
addtail x
Add a character $x$ at the end of the word.
end
Stop the computation. It is guarantee the last command is always an end.

For example, if you are given a word "pangfeng", then after "replace g d" you will have "pandfend". Then after "remove n" you will have "padfed". After "addhead a" you will have "apadfed". After "addtail s" you will have "apadfeds".

輸入說明

輸出說明

It has a testdata set. First line contains a string $S$, then following many commands to edit the word.

* $|S| \le 100000$
* $|\text{#valid command}| \le 100000$
* $|\text{invalid command}| \le 20$

範例輸入 #1

pangfeng
replace g d
remove n
addhead a
addtail s
end
pangfeng
replace g d
remove n
addhead a
addtail s
addpangfeng b
addhead a
end

範例輸出 #1

apadfeds
invalid command addpangfeng

測資資訊：

記憶體限制： 64 MB
公開測資點#0 (9%): 1.0s , <1K
公開測資點#1 (9%): 1.0s , <1K
公開測資點#2 (9%): 1.0s , <1M
公開測資點#3 (9%): 1.0s , <1K
公開測資點#4 (9%): 1.0s , <1M
公開測資點#5 (9%): 1.0s , <1M
公開測資點#6 (9%): 1.0s , <1M
公開測資點#7 (9%): 1.0s , <1M
公開測資點#8 (9%): 1.0s , <1M
公開測資點#9 (9%): 1.0s , <1M
公開測資點#10 (10%): 1.0s , <10M

提示：

標籤:

字串處理

出處:

NTU 批改娘計算機程式設計課程 [管理者： morris821028@gmail.com

morris1028 (碼畜) ]

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