POJ - 2752 - Seek the Name, Seek the Fame (KMP-打印前缀后缀长度)

题目传送:POJ - 2752

思路:就是每次都去找当前串的最大相同前缀后缀,找到一个后,令该相同前缀后缀为当前串,再循环调用,注意因为kmp的next函数中的最大相同前缀后缀不包含自身,所以每次都要多输出原串自身长度

AC代码:

#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;

const int maxn = 1000005;
char s[maxn];
int next[maxn];
int ans[maxn];
int len;

void get_next(char *s) {
	next[0] = -1;
	int i = 0, j = -1;
	while(i < len) {
		if(j == -1 || s[i] == s[j]) next[++ i] = ++ j;
		else j = next[j];
	}
}

int main() {
	while(scanf("%s", s) != EOF) {
		int tot = 0;
		len = strlen(s);
		get_next(s);

		int tmp = next[len];
		if(tmp != 0) {
			ans[tot ++] = tmp;
		}
		while(next[tmp] > 0) {
			tmp = next[tmp];
			ans[tot ++] = tmp;
		}
		for(int i = tot - 1; i >= 0; i --) {
			printf("%d ", ans[i]);
		}
		printf("%d\n", len);
	}
	return 0;
}
时间: 2024-10-05 04:27:44

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