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kmp

void GetNextval(char* p, int next[])  
{  
    int pLen = strlen(p);  
    next[0] = -1;  
    int k = -1;  
    int j = 0;  
    while (j < pLen - 1)  
    {  
        //p[k]表示前缀,p[j]表示后缀    
        if (k == -1 || p[j] == p[k])  
        {  
            ++j;  
            ++k;  
            
            if (p[j] != p[k])  
                next[j] = k;   
            else  
                //因为不能出现p[j] = p[ next[j ]],所以当出现时需要继续递归,k = next[k] = next[next[k]]  
                next[j] = next[k];  
        }  
        else  
        {  
            k = next[k];  
        }  
    }  
}

int KmpSearch(char* s, char* p)  
{  
    int i = 0;  
    int j = 0;  
    int sLen = strlen(s);  
    int pLen = strlen(p);  
    while (i < sLen && j < pLen)  
    {  
        //①如果j = -1,或者当前字符匹配成功(即S[i] == P[j]),都令i++,j++      
        if (j == -1 || s[i] == p[j])  
        {  
            i++;  
            j++;  
        }  
        else  
        {  
            //②如果j != -1,且当前字符匹配失败(即S[i] != P[j]),则令 i 不变,j = next[j]      
            //next[j]即为j所对应的next值        
            j = next[j];  
        }  
    }  
    if (j == pLen)  
        return i - j;  
    else  
        return -1;  
}