2124.cpp

这是哈尔滨工业大学acmOJ的源代码

/*  This Code is Submitted by wywcgs for Problem 2124 on 2005-10-21 at 12:51:06 */ 
#include <cstdio>

int main()
{
	long long d[32] = {1, 0};
	int n, i, j;
	
	for(i = 2; i < 32; i++) {
		d[i] = d[i-2];
		for(j = i-2; j >= 0; j -= 2) {
			d[i] += d[j] * 2;
		}
	}
	while(scanf("%d", &n) == 1) {
		if(n == -1) {
			return 0;
		} else {
			printf("%lld\n", d[n]);
		}
	}
	
	return 0;
}