const int MAXN = 1e5 + 5e2;
int Next[MAXN];
char str1[MAXN], str2[MAXN]; //这里以str1为母串，str2为子串

inline void getNext() {
    Next[0] = -1;
    int len = strlen(str2);
    int j = 0;
    int k = -1;

    while (j < len) {
        if (k == -1 || str2[j] == str2[k]) {
            k++;
            j++;
            Next[j] = k;
        } else {
            k = Next[k];
        }
    }
}

inline int kmp() {
    int len1 = strlen(str1);
    int len2 = strlen(str2);
    getNext();

    int res = 0;
    int j = 0;
    for (int i = 0; i < len1; i++) {
        while (j && str2[j] != str1[i]) {
            j = Next[j];
        }
        if (str2[j] == str1[i]) {
            j++;
        }
        if (j == len2) {
            res++;
            j = 0;//字符不能重复使用，初始化模式串位置
        }
    }
    return res;
}