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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve()
  5. {
  6.     int n;
  7.     cin >> n;
  8.  
  9.     vector<vector<int>> mat(n, vector<int> (n));
  10.  
  11.     int l = 1, r = n*n;
  12.  
  13.     for(int i = 0; i < n; i++)
  14.     {
  15.         if(i % 2 == 0)
  16.         {
  17.             for(int j = 0; j < n; j++)
  18.             {
  19.                 if((i + j) % 2 == 0)
  20.                     mat[i][j] = l++;
  21.                 else
  22.                     mat[i][j] = r--;
  23.             }
  24.         }
  25.         else
  26.         {
  27.             for(int j = n - 1; j >= 0; j--)
  28.             {
  29.                 if((i + j) % 2 == 0)
  30.                     mat[i][j] = l++;
  31.                 else
  32.                     mat[i][j] = r--;
  33.             }
  34.         }
  35.     }
  36.  
  37.     for(int i = 0; i < n; i++)
  38.     {
  39.         for(int j = 0; j < n; j++)
  40.             cout << mat[i][j] << " ";
  41.         cout << endl;
  42.     }
  43. }
  44.  
  45. int main() {
  46.     // your code goes here
  47.     int t;
  48.     cin >> t;
  49.  
  50.     while(t--)
  51.         solve();
  52. }
Success #stdin #stdout 0s 5328KB
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1 4 
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1 9 2 
7 3 8 
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https://ideone.com/pm5uZR
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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