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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const int N = 1005;
  4.  
  5. int t, n, k, A[N][N] = {};
  6.  
  7. void del(){
  8.     for (int i=0; i<n; i++) {
  9.         fill(A[i], A[i]+n, 0);
  10.     }
  11. }
  12.  
  13. void print(){
  14.     for (int i=0; i<n; i++){
  15.         for (int j=0; j<n; j++){
  16.             cout << A[i][j]<< " ";
  17.         }
  18.         cout << "\n";
  19.     }
  20. }
  21.  
  22. void fillin(int &cnt) {
  23.     for (int i=0; i<n; i++){
  24.         for (int j=0; j<n; j++){
  25.             if (!A[i][j])A[i][j]= cnt++;
  26.         }
  27.     }
  28. }
  29.  
  30. void progress() {
  31.     int cnt =1;
  32.     if (k<n||k>n*2-1) {cout << "-1\n"; return;}
  33.     else if (k==n){
  34.         while(cnt<=n) {
  35.             A[cnt-1][cnt-1]=cnt;
  36.             cnt++;
  37.         }
  38.         fillin(cnt);
  39.         print();
  40.         return;
  41.     }
  42.     k%=n;
  43.     for (int i=0; i<n; i++){
  44.         if(i==n-k-1){
  45.             for (int j=i; j<n; j++){
  46.                 A[i][j]=cnt++;
  47.             }
  48.             i++;
  49.         }
  50.         if (i==n) break;
  51.         A[i][i]=cnt++;
  52.     }
  53.     fillin(cnt);
  54.     print();
  55. }
  56.  
  57. int main() {
  58.     ios_base::sync_with_stdio(0);
  59.     cin.tie(0);
  60.  
  61.     //input
  62.     cin >> t;
  63.  
  64.     //call
  65.     for (int i=0; i<t; i++) {
  66.         cin >> n >> k;
  67.         progress();
  68.         del();
  69.     }
  70.  
  71.  
  72.  
  73.     return 0;
  74. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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5
3 0
3 5
5 5
4 3
1 1
stdout
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-1
1 2 3 
6 4 7 
8 9 5 
1 6 7 8 9 
10 2 11 12 13 
14 15 3 16 17 
18 19 20 4 21 
22 23 24 25 5 
-1
1
https://ideone.com/9jEH06
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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