package sy1;

public class ViolenceMatch {
    public static void main(String[] args) {
        String str1 = "AAB AAABBB AABBXX";
        String str2 = "AABBXX";
        int index = violenceMatch(str1, str2);
        System.out.println("index=" + index);
    }

    public static int violenceMatch(String str1, String str2) {
        char[] s1 = str1.toCharArray();
        char[] s2 = str2.toCharArray();
        int s1Len = s1.length;
        int s2Len = s2.length;
        int i = 0; // i索引指向s1
        int j = 0; // j索引指向s2
        while (i < s1Len && j < s2Len) {
            if (s1[i] == s2[j]) { //找到
                i++;
                j++;
            } else { //s1[i]!=s2[j]
                i = i - (j - 1);
                j = 0;
            }
        }
        if (j == s2Len) {
            return i - j;
        } else {
            return -1;
        }

    }
}