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  1. // Mohib Manva.
  2. #include <bits/stdc++.h>
  3. #include <random>
  4. using namespace std;
  5.  
  6. #define ll long long
  7. #define all(vc) vc.begin(), vc.end()
  8.  
  9. mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());
  10.  
  11. int main() {
  12. 	int t = 1;
  13. 	scanf("%d", &t);
  14. 	while (t--) {
  15. 		int n, m;
  16. 		scanf("%d %d", &n, &m);
  17.  
  18. 		if (m > 2 * n) {
  19. 			puts("NO");
  20. 			continue;
  21. 		}
  22.  
  23.  
  24. 		puts("YES");
  25. 		if (m <= n) {
  26. 			for (int i = 1; i <= 2 * n; i++) {
  27. 				for (int j = 1; j <= m; j++) {
  28. 					printf("%d ", j);
  29. 				}
  30. 				puts("");
  31. 			}
  32. 			continue;
  33. 		}
  34.  
  35. 		for (int i = 1; i <= n; i++) {
  36. 			int st1 = i;
  37. 			int st2 = 1;
  38. 			for (int j = 1; j <= m; j += 2) {
  39. 				printf("%d ", st1);
  40. 				if (j + 1 <= m) {
  41. 					printf("%d ", st2);
  42. 				}
  43. 				if (st1 == n) {
  44. 					st1 = 1;
  45. 				} else {
  46. 					st1++;
  47. 				}
  48. 				if (st2 == n) {
  49. 					st2 = 1;
  50. 				} else {
  51. 					st2++;
  52. 				}
  53. 			}
  54. 			puts("");
  55.  
  56. 			st1 = i;
  57. 			st2 = 2;
  58. 			for (int j = 1; j <= m; j += 2) {
  59. 				printf("%d ", st1);
  60. 				if (j + 1 <= m) {
  61. 					printf("%d ", st2);
  62. 				}
  63. 				if (st1 == n) {
  64. 					st1 = 1;
  65. 				} else {
  66. 					st1++;
  67. 				}
  68. 				if (st2 == n) {
  69. 					st2 = 1;
  70. 				} else {
  71. 					st2++;
  72. 				}
  73. 			}
  74. 			puts("");
  75. 		}
  76. 	}
  77. 	return 0;
  78. }
Success #stdin #stdout 0s 5284KB
comments (?)
stdin
copy 
1
3 4
stdout
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YES
1 1 2 2 
1 2 2 3 
2 1 3 2 
2 2 3 3 
3 1 1 2 
3 2 1 3
https://ideone.com/pWUMT5
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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