ACM模版

k叉

/* * INIT: init(); * 注: tree[i][tk]>0时表示单词存在, 当然也可赋予它更多含义; */
const int tk = 26, tb = 'a';    // tk叉; 起始字母为tb;
const int N = 1010;             // N: 最大结点个数
int top, tree[N][tk + 1];

void init()
{
    top = 1;
    memset(tree[0], 0, sizeof(tree[0]));
    return ;
}

int sear(char *s)               // 失败返回0
{
    for (int rt = 0; rt == tree[rt][*s - tb];)
    {
        if (*(++s) == 0)
        {
            return tree[rt][tk];
        }
    }
    return 0;
}

void insert(char *s, int rank = 1)
{
    int rt, nxt;
    for (rt = 0; *s; rt = nxt, ++s)
    {
        nxt = tree[rt][*s - tb];
        if (0 == nxt)
        {
            tree[rt][*s - tb] = nxt = top;
            memset(tree[top], 0, sizeof(tree[top]));
            top++;
        }
    }
    tree[rt][tk] = rank;    // 1表示存在0表示不存在,也可以赋予其其他含义
}

void delt(char *s)          // 只做标记, 假定s一定存在
{
    int rt = 0;
    for (; *s; ++s)
    {
        rt = tree[rt][*s - tb];
    }
    tree[rt][tk] = 0;
    return ;
}

int prefix(char *s)         // 最长前缀
{
    int rt = 0, lv;
    for (lv = 0; *s; ++s, ++lv)
    {
        rt = tree[rt][*s - tb];
        if (rt == 0)
        {
            break;
        }
    }
    return lv;
}

左儿子右兄弟

/* * 左孩子右兄弟 * INIT: init(); */
const int N = 1010;
int top;

struct trie
{
    char c;
    int l, r, rk;
} tree[N];

void init()
{
    top = 1;
    memset(tree, 0, sizeof(tree[0]));
}

int sear(char *s)   // 失败返回0
{
    int rt;
    for (rt = 0; *s; ++s)
    {
        for (rt = tree[rt].l; rt; rt = tree[rt].r)
        {
            if (tree[rt].c == *s)
            {
                break;
            }
        }
        if (rt == 0)
        {
            return 0;
        }
    }
    return tree[rt].rk;
}

void insert(char *s, int rk = 1)    // rk: 权或者标记
{
    int i, rt;
    for (rt = 0; *s; ++s, rt = i)
    {
        for (i = tree[rt].l; i; i = tree[i].r)
        {
            if (tree[i].c == *s)
            {
                break;
            }
        }
        if (i == 0)
        {
            tree[top].r = tree[rt].l;
            tree[top].l = 0;
            tree[top].c = *s;
            tree[top].rk = 0;
            tree[rt].l = top;
            i = top++;
        }
    }
    tree[rt].rk = rk;
    return ;
}

void delt(char *s)  // 假定s已经存在,只做标记
{
    int rt;
    for (rt = 0; *s; ++s)
    {
        for (rt = tree[rt].l; rt; rt = tree[rt].r)
        {
            if (tree[rt].c == *s)
            {
                break;
            }
        }
        tree[rt].rk = 0;
    }
    return ;
}

int profix(char *s) // 最长前缀
{
    int rt = 0, lv;
    for (lv = 0; *s; ++s, ++lv)
    {
        for (rt = tree[rt].l; rt; rt = tree[rt].r)
        {
            if (tree[rt].c == *s)
            {
                break;
            }
        }
        if (rt == 0)
        {
            break;
        }
    }
    return lv;
}