func_code_string: #include <bits/stdc++.h>   using namespace std;   int t, n, a[1000], k;   int main()   {       cin >> t;       while(t--)       {           cin >> n >> k;           if(k <= (n - 1)/2)           {               int spt = 0, spt1 = k + 1;               for(int i = 1; i <= 2*k + 1; i++)               {                   if(i%2 == 1)                       a[i] = ++spt;                   else a[i] = ++spt1;               }               for(int i = 2*k + 2; i <= n; ++i)                   a[i] = ++spt1;               for(int i = 1; i <= n; ++i)                   cout << a[i] <<    ;               cout <<   n ;           }           else cout << -1 <<   n ;       }       return 0;   }   