*****

叉姐代码
第i个数 第j轮
dp[i][j] = dp[i-1][j]+dp[i][j-1]
dp[i][j] = dp[i-2][j]+2*dp[i-1][j-1] +dp[i][j-2]
mod 2
所以dp[i][j] = dp[i-2^k][j] + dp[i][j-2^k]

补不动啊……改天开个dp专题多练练 QAQ

#include <cstdio>const int N = 200000;int a[N];int main(){    int T;    scanf("%d", &T);    while (T --) {        int n, m;        scanf("%d%d", &n, &m);        for (int i = 0; i < n; ++ i) {            scanf("%d", a + i);        }        for (int k = 0; 1 << k <= m; ++ k) {            if (m >> k & 1) {                for (int i = 1 << k; i < n; ++ i) {                    a[i] ^= a[i - (1 << k)];                }            }        }        for (int i = 0; i < n; ++ i) {            printf("%d%c", a[i], " \n"[i == n - 1]);        }    }}