Ultraviolet A 1519, ultraviolet

Ultraviolet A 1519, ultraviolet

Link: Ultraviolet A 1519-Dictionary Size

A dictionary composed of n strings. Now you need to add new words and select non-empty prefixes and non-empty suffixes from existing words to form a new word. Ask how many words can be made up.

Solution: Create a Prefix Tree and a suffix tree, and add a string with a length of 1 after deducting the middle part.

#include <cstdio>#include <cstring>#include <algorithm>using namespace std;const int maxn = 400005;const int sigma_size = 26;typedef long long ll;struct Tire {    int sz, g[maxn][sigma_size];    int c[sigma_size];    void init ();    int idx(char ch);    void insert(char* s);}pre, suf;int main () {    int N;    while (scanf("%d", &N) == 1 && N) {        char word[45];        int vis[sigma_size];        memset(vis, 0, sizeof(vis));        pre.init();        suf.init();        for (int i = 0; i < N; i++) {            scanf("%s", word);            int n = strlen(word);            if (n == 1)                vis[word[0] - 'a'] = 1;            pre.insert(word);            reverse(word, word + n);            suf.insert(word);        }        ll ans = (ll)(pre.sz - 1) * (suf.sz - 1);        for (int i = 0; i < sigma_size; i++)            ans -= (ll)pre.c[i] * suf.c[i] - vis[i];        printf("%lld\n", ans);    }    return 0;}void Tire::init () {    sz = 1;    memset(g[0], 0, sizeof(g[0]));    memset(c, 0, sizeof(c));}int Tire::idx (char ch) {    return ch - 'a';}void Tire::insert(char* s) {    int u = 0, n = strlen(s);    for (int i = 0; i < n; i++) {        int v = idx(s[i]);        if (g[u][v] == 0) {            memset(g[sz], 0, sizeof(g[sz]));            g[u][v] = sz++;            if (i)                c[v]++;        }        u = g[u][v];    }}

How can I protect my skin and protect my skin when swimming in summer? (From to every morning, 20 days, how can I stay the same?) What kind of sunscreen?

1. You can buy the type of sun protection swimsuit (like water with only hands and feet and head exposed), the head is a sun protection swimming cap (full head, only glasses and nose exposure.
2. swimming ashore, you can choose to rest in the shade, or use a bath towel to shoulder to protect your skin.
3. After the game, you should immediately wipe your body with moisture, because the wet skin is sensitive to sunlight.
4. place some oil or sunscreen on the exposed skin.
This is basically the case. Please handle it as appropriate!