题解 | #谁是你的潜在朋友#

#include<iostream>
#include<vector>

int main()
{
    int n, m;
    int book[201];
    std::vector<int> v;
    while (std::cin >> n >> m)
    {
        std::fill(book, book+201, 0);
        v.reserve(n);
        int a;
        for (int i = 0; i < n; i++)
        {
            std::cin >> a;
            book[a]++;//使用标记数组，对带有相同图书编号的自动加1
            v.push_back(a);//记录输入图书编号的顺序
        }
        for(int i : v)
        {
            if(book[i] > 1)
                std::cout << book[i]-1 << std::endl;
            else
                std::cout << "BeiJu" << std::endl;
        }
    }
    
}