題目：實現一個圍圈報數的小函式，7個人圍一圈，從第1個人開始報數，報道3的人結束遊戲，計算出最後剩下一個人的時候，他是第幾個人。
程式碼：
預設從第一個人開始報數

#include<iostream>
using namespace std;
struct Lnode{
    int data;
    Lnode * next;
};
int Cyclecountoff(int people, int num){
    Lnode *head,* pnode, *prepnode=NULL, *curr = NULL;
    head = pnode = new Lnode;
    pnode->data = 1
 
;
    pnode->next = pnode;
    curr = pnode;
    for (int i = 2; i <= people; i++){
        Lnode* tmp = new Lnode;
        tmp->data = i;
        tmp->next =curr->next;
        curr->next = tmp;
        curr = tmp;     
    }
    prepnode = curr;
    while (people--){
        for (int
 
 s = 1; s < num; s++){
            prepnode = pnode;
            pnode = pnode->next;
        }
        prepnode->next = pnode->next;
        printf("刪除的第一個元素%d\n", pnode->data);
        pnode = prepnode->next;
    }
    return 0;
}
int main(){
    Cyclecountoff(7,3);
    system("pause"
 
);

}

設定從第N個人開始報數

#include<iostream>
using namespace std;
struct Lnode{
    int data;
    Lnode * next;
};
int Cyclecountoff(int people, int N, int num){
    Lnode *head,* pnode, *prepnode=NULL, *curr = NULL;
    head = pnode = new Lnode;
    pnode->data = 1;
    pnode->next = pnode;
    curr = pnode;
    for (int i = 2; i <= people; i++){
        Lnode* tmp = new Lnode;
        tmp->data = i;
        tmp->next =curr->next;
        curr->next = tmp;
        curr = tmp;     
    }
    prepnode = curr;
    for (int j = 1; j < N; j++){
        prepnode = pnode;
        pnode = pnode->next;
    }
    while (people--){
        for (int s = 1; s < num; s++){
            prepnode = pnode;
            pnode = pnode->next;
        }
        prepnode->next = pnode->next;
        printf("刪除的第一個元素%d\n", pnode->data);
        pnode = prepnode->next;
    }
    return 0;
}
int main(){
    Cyclecountoff(7,2,3);
    system("pause");

}