#include <iostream>
#include <cstring>
#include <sstream>
#include <limits.h>

struct node {
	int id;
	node* next;
	node* prev;
};

void insert_one (node* first, node* curr) {
	node* insertion_prev = (*first).prev;
	node* insertion_next = first;
	(*insertion_next).prev = curr;
	(*insertion_prev).next = curr;
	(*curr).next = insertion_next;
	(*curr).prev = insertion_prev;
}

void remove_one (node* removal) {
	node* removal_prev = (*removal).prev;
	node* removal_next = (*removal).next;
	(*removal_next).prev = removal_prev;
	(*removal_prev).next = removal_next;
	delete removal;
}

int main () {
	
	int n = 0;
	while (n == 0) {
		std::string input;
		int input_n;
		std::cout << "请输入小人个数: ";
		std::cin >> input;
		try {
			input_n = stoi(input);
			if (input_n < 1) throw std::exception();
		} catch (std::out_of_range) {
			std::cout << "你输入的数字 \"" << input << "\" 太大了，它最大只能是 " << INT_MAX << std::endl;
			continue;
		} catch (std::exception) {
			std::cout << "你的输入是 \"" << input << "\", 但小人的数量必须是一个大于 0 的整数！" << std::endl;
			continue;
		}
		std::cout << "小人个数为 " << input_n << " ? [y/n]";
		std::cin >> input;
		if (input == "y")
			n = input_n;
	}
	
	node* first = new node;
	(*first).id = 1;
	(*first).prev = first;
	(*first).next = first;
	int count = 1;
	std::cout << "招募了小人 #" << 1 << " ." << std::endl;
	
	for (int i = 2; i <= n; i++) {
		node* curr = new node;
		(*curr).id = i;
		insert_one(first, curr);
		count++;
		std::cout << "招募了小人 #" << 1 << " , 它前面是 #" << (*(*curr).prev).id << " , 它后面是 #" << (*(*curr).next).id << std::endl;
	}
	
	std::stringstream out_roll;
	
	int counting = 0;
	node* next_one = (*first).prev;
	while (count > 1) {
		node* current = next_one;
		next_one = (*next_one).next;
		counting++;
		std::cout << "小人 #" << (*current).id << " 数到了" << counting;
		if (counting == 3) {
			out_roll << "#" << (*current).id << " ";
			remove_one(current);
			counting = 0;
			count--;
			std::cout << " , 出列！还剩下 " << count << "个小人。";
		} else {
			std::cout << " .";
		}
		std::cout << std::endl;
	}
	
	std::cout << "=====" << std::endl
			<< "最终剩下了小人 #" << (*next_one).id << " !" << std::endl;
	std::cout << "小人的出列顺序是: " << out_roll.str() << "." << std::endl;
	
	return 0;
	
}