dl求助

#include <iostream>
using namespace std;
bool a[31];
int n , la , k;
void re(){
	la = k;
	for(int i=1;i <= n;i++){
		a[i] = true;
	}
}
void end();
int main(){
	re();
	int m=1;
	cin >> k;
	n = k * 2;
	la = k;
	int r = 1;
	for(int k=1;k <= n;k++,m++){
		for(int i=1;true;i++,r++){
			if(la == 0) break;
			if(a[i] != false){
				r--;
				continue;
			}
			if(r == m){
				if(i <= k) break;
				r = 0;
				la--;
				a[i] = false;
			}
		}
		if(la == 0) break;
		re();
	}
	cout << m;
	//end();
	return 0;
}
void end(){
	cout << endl;
	system("pause");
}