[模板]PAM

模板([luogu5496])

题目

#include<bits/stdc++.h>
using namespace std;
const int N = 5e5 + 10;
char s[N];
int Len;
struct PAM{
	int last, cnt, len[N], fail[N], num[N], k, p, ch[N][26], p1, c[N];
	//char s[N];
	void init(char *s) {
		last = 0, cnt = 1, len[0] = 0, len[1] = -1, fail[0] = 1, fail[1] = 0, s[0] = 26;
	}
	void insert() {
		for (int i = 1; i <= Len; i++) {
			s[i] = (s[i] - 97 + k) % 26 + 97;
			c[i] = s[i] - 'a';
			p = last;
			while (s[i - len[p] - 1] != s[i])
				p = fail[p];
			if (!ch[p][s[i]]) {
				len[++cnt] = len[p] + 2, p1 = fail[p];
				while (s[i - len[p1] - 1] != s[i])
					p1 = fail[p1];
				fail[cnt] = ch[p1][s[i]];
				num[cnt] = num[fail[cnt]] + 1;
				ch[p][s[i]] = cnt;
			}
			last = ch[p][s[i]];
			printf("%d%c", num[last], (i == Len) ? '
' : ' ');
			k = num[last];
			}
	}
} s1;
int main() {
	scanf("%s", s + 1);
	Len = strlen(s + 1);
	s1.init(s);
	s1.insert();
	return 0;
}