110 lines
1.9 KiB
C++
110 lines
1.9 KiB
C++
#include <bits/stdc++.h> // {{{
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// https://codeforces.com/blog/entry/96344
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#pragma GCC optimize("O2,unroll-loops")
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#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
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using namespace std;
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using i32 = int32_t;
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using u32 = uint32_t;
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using i64 = int64_t;
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using u64 = uint64_t;
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using f64 = double;
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using f128 = long double;
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#if __cplusplus >= 202002L
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template <typename T>
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constexpr T MIN = std::numeric_limits<T>::min();
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template <typename T>
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constexpr T MAX = std::numeric_limits<T>::max();
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template <typename T>
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[[nodiscard]] static T sc(auto&& x) {
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return static_cast<T>(x);
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}
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template <typename T>
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[[nodiscard]] static T sz(auto&& x) {
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return static_cast<T>(x.size());
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}
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#endif
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static void NO() {
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std::cout << "NO\n";
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}
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static void YES() {
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std::cout << "YES\n";
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}
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template <typename T>
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using vec = std::vector<T>;
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#define all(x) (x).begin(), (x).end()
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#define rall(x) (x).rbegin(), (x).rend()
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#define ff first
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#define ss second
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#ifdef LOCAL
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#define db(...) std::print(__VA_ARGS__)
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#define dbln(...) std::println(__VA_ARGS__)
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#else
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#define db(...)
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#define dbln(...)
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#endif
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// }}}
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void solve() {
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u32 n;
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cin >> n;
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vec<u32> a(n);
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for (u32 i = 0; i < n; i += 2) a[i] = i >> 1;
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u32 xe = 0;
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for (u32 i = 0; i < n; i += 2) xe ^= a[i];
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u32 odd = n >> 1;
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if (!odd) {
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for (u32 i = 0; i < n; ++i) cout << a[i] << " \n"[i == n - 1];
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return;
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}
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const u32 BIG = 1u << 20;
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u32 xo = 0;
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for (u32 k = 0; k + 2 < odd; ++k) {
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a[1 + 2 * k] = BIG + k;
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xo ^= a[1 + 2 * k];
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}
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if (odd == 1) {
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a[1] = BIG;
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a[0] ^= xe ^ BIG;
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} else {
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u32 diff = xe ^ xo;
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u32 p = BIG + odd - 2;
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a[2 * odd - 3] = p;
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a[2 * odd - 1] = p ^ diff;
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}
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for (u32 i = 0; i < n; ++i)
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cout << a[i] << " \n"[i == n - 1];
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}
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int main() { // {{{
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cin.tie(nullptr)->sync_with_stdio(false);
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cin.exceptions(cin.failbit);
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u32 tc = 1;
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cin >> tc;
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for (u32 t = 0; t < tc; ++t) {
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solve();
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}
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return 0;
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}
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// }}}
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