这是答案代码,下面这两句看不懂!求指点!
#include<cstdio>
#include<cstring>
const int maxn = 100000 + 5;
int last, cur, next[maxn];
char s[maxn];
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;//这两句到底什么意思啊,看不明白!!
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;
}