用时：24ms

C++ 代码

#include<iostream>
using namespace std;

const int N = 101;
int cnt[N] = {};  // 记录单词总共出现次数
int page[N] = {};  // 记录单词出现的文章数

int main() {
    // n: 文章篇数；m: 每篇文章的单词上限
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        int w, num;
        bool judge[N] = {};  // 防止重复记录文章数
        cin >> w;
        while (w--) {
            cin >> num;
            cnt[num]++;
            if (judge[num] == 0) page[num]++;
            judge[num] = 1;
        }
    }
    for (int i = 1; i <= m; i++) {
        printf("%d %d\n", page[i], cnt[i]);
    }

    return 0;
}