UVA - 11988 Broken Keyboard（用数组实现链表）

You'retyping a long text with a broken keyboard. Well it's not so badly broken. Theonly problem

withthe keyboard is that sometimes the \home" key or the \end" key getsautomatically pressed

(internally).

You'renot aware of this issue, since you're focusing on the text and did not eventurn on the

monitor!After you nished typing, you can see a text on the screen (if you turn on themonitor).

InChinese, we can call it Beiju. Your task is to nd the Beiju text.

 

Input

Thereare several test cases. Each test case is a single line containing at least oneand at most 100,000

letters,underscores and two special characters `[' and`]'. `['means the \Home" key is pressed

internally,and `]'means the \End" key is pressed internally. The input is terminated byend-of- file(EOF).

 

Output

Foreach case, print the Beiju text on the screen.

 

SampleInput

This_is_a_[Beiju]_text

[[]][][]Happy_Birthday_to_Tsinghua_University

 

SampleOutput

BeijuThis_is_a__text

Happy_Birthday_to_Tsinghua_University

#include <cstdio>#include <string.h>using namespace std;const int MAX = 100005;int last, cur, next[MAX];char s[MAX];int main(){    while(scanf("%s", s+1) == 1){        int n = strlen(s+1);        last = cur = 0;        next[0] = 0;        for(int i = 1; i <= n; i++){            char ch = s[i];            if(ch == '[')  cur = 0;            else if(ch == ']')  cur = last;            else{                next[i] = next[cur];                next[cur] = i;                if(cur == last) last = i;                cur = i;            }        }        for(int i = next[0]; i != 0; i = next[i])            printf("%c", s[i]);        printf("\n");    }    return 0;}