KMP算法--通俗易通

Posted 2020-11-26 mrrightzhao

public class KMPAlgorithm {
    public static void main(String[] args) {
        String str1 = "BBC ABCDAB ABCDABCDABDE";
        String str2 = "ABCDABD";
        int[] kmpTable = kmpTable(str2);
        System.out.println(Arrays.toString(kmpTable));
    }

    public static int[] kmpTable(String dest) {

        int next[] = new int[dest.length()];
        next[0] = 0; // 如果字符的长度为1，则部分匹配值就是0
        for (int i = 0, j = 1; j < dest.length(); j++) {            //ABCDABD

            while (i > 0 && dest.charAt(i) != dest.charAt(j)) {
                i = next[i - 1];
            }

            if (dest.charAt(i) == dest.charAt(j)) { //
                i++;
            }

            next[j] = i;
        }

        return next;
    }
}