【学习版】

【C语言】

#include <iostream>
#include <string>
#include <algorithm>
#include <cmath>
#include <cstdlib>
using namespace std;
typedef struct Lnode {
    int date;
    struct Lnode* next;
}Lnode, * Linklist;
int In(Linklist& L) {
    L = new Lnode;
    L->next = NULL;
    return 0;
}
void Cl(Linklist& L, int n) {
    Lnode* r = L;
    for (int i = 1; i <= n; i++) {
        Lnode* p = new Lnode;
        p->date = i;
        p->next = NULL;
        r->next = p;
        r = p;
    }
    r->next = L->next;

}
int main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    std::cout.tie(0);

    int n, m, count = 0;
    Linklist A;
    In(A);
    cin >> n;
    Cl(A, n);
    cin >> m;
    Lnode* p = A;
    while (n > 1) {
        if (count == m) {
            Lnode* q = p->next;
            p->next = q->next;
            delete q;
            count = 0;
            n--;
        }
        else {
            for (int i = 1; i < m; i++) {
                p = p->next;
            }
            count = m;
        }
    }
    cout << p->next->date;
    return 0;
}

【C++】

#include<iostream>

struct LinkedNode {
	int val;
	LinkedNode* next;
	LinkedNode(int x) :val(x), next(nullptr) {};
};
void initList(LinkedNode* list,int n) {
	LinkedNode* cur = list;
	for (int i = 1; i <= n; i++) {
		LinkedNode* newNode = new LinkedNode(i);
		cur->next = newNode;
		cur = cur->next;
	}
	cur->next = list->next;
}
void deleteList(LinkedNode* list, int n,int k) {
	LinkedNode* cur = list;
	while (n > 1) {
		for (int i = 0; i < k-1; i++) {
			cur = cur->next;
		}
		LinkedNode* tmp = cur->next;
		cur->next = cur->next->next;
		delete tmp;
		n--;
	}
	std::cout << cur->val;
}
int main() {
	LinkedNode* list = new LinkedNode(0);
	int n, k;
	std::cin >> n >> k;
	initList(list, n);
	deleteList(list, n, k);
	return 0;
}

【STL】

#include<iostream>
#include<vector>

int main() {

	int n, k;
	std::cin >> n >> k;
	std::vector<int> vec(n);
	for (int i = 0; i < n; i++) vec[i] = i + 1;
	int cur = 0;
	while (vec.size() > 1) {
		cur = (cur + k -1) % vec.size();
		vec.erase(vec.begin() + cur);
	}
	std::cout << vec[0];
	return 0;
}