poj3444

简单题

View Code

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;

#define maxn 300

int n;
int f[maxn], g[maxn];

void input()
{
    for (int i = 0; i < n; i++)
        scanf("%d", &f[i]);
}

void work(int a)
{
    for (int i = 0; i < a; i++)
    {
        g[i * 2] = (f[i] + f[i + a]) / 2;
        g[i * 2 + 1] = (f[i] - f[i + a]) / 2;
    }
    for (int i = 0; i < 2 * a; i++)
        f[i] = g[i];
}

int main()
{
    //freopen("t.txt", "r", stdin);
    while (scanf("%d", &n), n)
    {
        input();
        for (int k = 1; k < n; k <<= 1)
            work(k);
        printf("%d", f[0]);
        for (int i = 1; i < n; i++)
            printf(" %d", f[i]);
        putchar('\n');
    }
    return 0;
}