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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. map<int,set<int> > lef;
  4. map<int,set<int> > rig;
  5.  
  6. int main()
  7. {
  8.     int t;
  9.     cin>>t;
  10.     int i,j;
  11.  
  12.  
  13.     int n,m,d,D;
  14.  
  15.     while(t--)
  16.     {
  17.          lef.clear();
  18.         rig.clear();
  19.         cin>>n>>m>>d>>D;
  20.         int flag=0;
  21.  
  22.  
  23.         int k=0;
  24.         int edgec=0;
  25.  
  26.          while(1)
  27.          {
  28.              for(i=1;i<=n;i++)
  29.              {
  30.  
  31.                int tmp=i+k;
  32.  
  33.                if(tmp>n)
  34.                 tmp-=n;
  35.  
  36.               lef[i].insert(tmp);
  37.               rig[tmp].insert(i);
  38.               edgec++;
  39.  
  40.               if(edgec==m)
  41.                 break;
  42.  
  43.              }
  44.              k++;
  45.  
  46.              if(k==n)
  47.                 break;
  48.  
  49.               if(edgec==m)
  50.                 break;
  51.  
  52.  
  53.          }
  54.  
  55.           for(i=1;i<=n;i++)
  56.       {
  57.           if(lef[i].size()<d || lef[i].size()>D || rig[i].size()<d || rig[i].size()>D)
  58.           {
  59.  
  60.               flag=1;
  61.               break;
  62.           }
  63.       }
  64.  
  65.        if(flag==1 || edgec!=m)
  66.       {
  67.           cout<<-1<<endl;
  68.           continue;
  69.       }
  70.  
  71.  
  72.        for(i=1;i<=n;i++)
  73.         {
  74.             for(auto it=lef[i].begin();it!=lef[i].end();it++)
  75.             {
  76.                 cout<<i<<" "<<*it<<endl;
  77.             }
  78.         }
  79.  
  80.  
  81.  
  82.  
  83.  
  84.  
  85.     }
  86.  
  87. }
Success #stdin #stdout 0s 3476KB
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stdin
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2
2 3 1 2
2 3 1 1
stdout
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1 1
1 2
2 2
-1
https://ideone.com/Gs0sbu
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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