【512. Trie字符串统计（cv）】

原题解

#include 

using namespace std;

const int N = 100010;

int son[N][26], cnt[N], idx;
char str[N];

void insert(char *str)
{
    int p = 0;
    for (int i = 0; str[i]; i ++ )
    {
        int u = str[i] - 'a';
        if (!son[p][u]) son[p][u] = ++ idx;
        p = son[p][u];
    }
    cnt[p] ++ ;
}

int query(char *str)
{
    int p = 0;
    for (int i = 0; str[i]; i ++ )
    {
        int u = str[i] - 'a';
        if (!son[p][u]) return 0;
        p = son[p][u];
    }
    return cnt[p];
}

int main()
{
    int n;
    scanf("%d", &n);
    while (n -- )
    {
        char op[2];
        scanf("%s%s", op, str);
        if (*op == 'I') insert(str);
        else printf("%d\n", query(str));
    }

    return 0;
}

作者：yxc
链接：https://www.acwing.com/activity/content/code/content/45282/
来源：AcWing