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  1. #include<bits/stdc++.h>
  2. #include<ext/pb_ds/assoc_container.hpp>
  3. #include<ext/pb_ds/tree_policy.hpp>
  4. #define ll long long int
  5. #define ld long double
  6. using namespace std;
  7. using namespace __gnu_pbds;
  8. #define FAST ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
  9. typedef tree<ll, null_type, less_equal<ll>, rb_tree_tag,tree_order_statistics_node_update> ordered_multiset;
  10. const ll N = 1e6 + 5, MOD1 = 998244353, MOD2 = 1e9 + 7;
  11.  
  12. void solve(int t) {
  13.     ll n, k;
  14.     cin >> n >> k;
  15.     vector<ll> ans(n + 1, -1);
  16.     if (k & 1) {
  17.         return void(cout << "No");
  18.     }
  19.     ll l = 1, r = n;
  20.     while (l <= r) {
  21.         if (k >= (r - l) * 2) {
  22.             k -= (r - l) * 2;
  23.             ans[l] = r;
  24.             ans[r] = l;
  25.             r--;
  26.             l++;
  27.         } else {
  28.             if (k & 1) {
  29.                 return void(cout << "No");
  30.             } else {
  31.                 ans[l] = l + k / 2;
  32.                 ans[l + k / 2] = l;
  33.                 k = 0;
  34.                 break;
  35.             }
  36.         }
  37.     }
  38.     if (k > 0) {
  39.         return void(cout << "No");
  40.     }
  41.     cout << "Yes\n";
  42.     for (int i = 1; i <= n; i++) {
  43.         cout << (ans[i] == -1 ? i : ans[i]);
  44.         if (i <= n - 1) cout << " ";
  45.     }
  46. }
  47.  
  48. signed main() {
  49.     FAST
  50. #ifndef ONLINE_JUDGE
  51.     freopen("input.txt", "r", stdin);
  52.     freopen("output.txt", "w", stdout);
  53. #endif
  54.     int t = 1;
  55.     cin>>t;
  56.     for (ll i = 1; i <= t; i++) {
  57.         solve(i);
  58.         if (i < t) cout << "\n";
  59.     }
  60. }
Runtime error #stdin #stdout #stderr 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
https://ideone.com/WItAnL
language:
C++14 (gcc 8.3)
created:
238 days ago
visibility:
secret

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