AcWing 3778. 平衡数组

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#include <cstdio>
using namespace std;
int t, n;
int main() {
    scanf("%d", &t);
    while (t--) {
        scanf("%d", &n);
        printf("%d\n", n - 1);
        for (int i = 1; i <= n - 1;) printf("%d ", ++i);
        puts("");
    }
    return 0;
}