到底哪错了。。。 #pragma warning(disable:4996) #include <deque> #include <iostream> using namespace std; int main(void) { freopen("in.txt", "r", stdin); int T; cin >> T; while (T--) { int n; cin >> n; deque<int> que; for (int i = n; i > 0; --i) { que.push_front(i); int x = que.back(); que.pop_back(); que.push_front(x); } for (int i = 0; i < n - 1; ++i) cout << que[i] << " "; cout << que[n - 1] << endl; }  }