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  1. #include<iostream>
  2. using namespace std;
  3. int main()
  4. {
  5.     int t,n,k,i;
  6.     cin>>t;
  7.     while(t--)
  8.     {
  9.         cin>>n>>k;
  10.  
  11.         if(n==1)
  12.         {
  13.         if(k==1)
  14.         cout<<"1"<<endl;
  15.         else
  16.         cout<<"-1"<<endl;
  17.         }
  18.         else
  19.         {
  20.  
  21.         if(k>n/2)
  22.         cout<<"-1"<<endl;
  23.         else {
  24.  
  25.         for(i=1;i<=k;i++)
  26.         {
  27.             cout<<(i<<1);
  28.  
  29.  
  30.  
  31.         }cout<<endl;
  32.         }
  33.         }
  34.  
  35.  
  36.  
  37.     }
  38.     return 0;
  39. }
Success #stdin #stdout 0s 3300KB
comments (?)
stdin 
1
10 4
stdout 
2468
https://ideone.com/2hRlP1
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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