func_code_string: #include <bits/stdc++.h>   using namespace std;   inline int read() {     int ret = 0, flag = 1;     char c = getchar();     while (c <  0  || c >  9 ) {       if (c ==  - ) flag = -1;       c = getchar();     }     while (c >=  0  && c <=  9 ) ret = ret * 10 + (c ^  0 ), c = getchar();     return flag * ret;   }   struct use {     int x, dis;   };   const int N = 5e3 + 5;   int T, n, d;   vector<int> edge[N];   int dad[N];   int build(int x, int dis) {     int sum = 0;     if ((x << 1) <= n) {       edge[x].push_back(x << 1);       sum += dis + 1;       sum += build(x << 1, dis + 1);     }     if ((x << 1 | 1) <= n) {       edge[x].push_back(x << 1 | 1);       sum += dis + 1;       sum += build(x << 1 | 1, dis + 1);     }     return sum;   }   void bfs() {     queue<use> q;     q.push({1, 0});     int now = 0;     vector<int> p1, p2;     while (q.empty() == 0) {       int x = q.front().x, dis = q.front().dis;       q.pop();       if (now != dis) {         now = dis, p1.clear(), p2.clear();       }       for (auto it = edge[x].begin(); it != edge[x].end(); it++) {         int y = *it;         if (edge[y].size() == 0) {           p1.push_back(y);           if (p2.size()) {             edge[p2[0]].push_back(y);             edge[x].erase(it);             return;           }         }         if (edge[y].size() != 2) p2.push_back(y);         q.push({y, dis + 1});       }     }   }   int main() {     T = read();     while (T--) {       n = read(), d = read();       for (int i = 1; i <= n; i++) edge[i].clear();       int mn = build(1, 0);       int mx = (n - 1) * n / 2;       if (!(mn <= d && d <= mx)) {         printf( NO n );         continue;       }       int now = mn;       while (now < d) {         bfs();         now++;       }       for (int i = 1; i <= n; i++) {         for (int j = 0; j < edge[i].size(); j++) dad[edge[i][j]] = i;       }       printf( YES n );       for (int i = 2; i <= n; i++) printf( %d  , dad[i]);       printf(  n );     }     return 0;   }   