【链表、队列】约瑟夫环问题

3253. 游戏

#include <iostream>
#include <queue>

using namespace std;

int n, k;

bool check(int x)
{
    if (x % k == 0 || (x % 10) == k) return true;
    return false;
}

int main()
{
    cin >> n >> k;
    queue<int> q;
    
    for (int i = 1; i <= n; i ++ ) q.push(i);
    
    int j = 1; // 从1开始报数
    while (q.size() > 1)
    {
        int t = q.front();
        q.pop();
        if (!check(j)) q.push(t); // 如果这个数不用出局，那就再加到队尾
        j ++ ;
    }
    cout << q.front() << endl;
    return 0;
}

3559. 围圈报数

#include <iostream>

using namespace std;

const int N = 55;

int n;
int ne[N];

int main()
{
    int T;
    cin >> T;
    while (T -- )
    {
        cin >> n;
        for (int i = 1; i < n; i ++ ) ne[i] = i + 1;
        ne[n] = 1;
        
        int p = n;
        for (int i = 0; i < n; i ++ )
        {
            p = ne[ne[p]]; // 走两步
            cout << ne[p] << ' ';
            ne[p] = ne[ne[p]]; // 删掉一个节点
        }
        cout << endl;
    }
    return 0;
}