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  1. #include <bits/stdc++.h>
  2.  
  3. #define MOD 1000000007
  4.  
  5. using namespace std;
  6.  
  7. long long dp[3][3],temp[3][3];
  8.  
  9. int main()
  10. {
  11. 	int t;
  12. 	scanf("%d",&t);
  13. 	while (t --) {
  14. 		int n,i,j,k,cur;
  15. 		long long ans;
  16. 		scanf("%d",&n);
  17. 		if (n == 1) {
  18. 			ans = 3;
  19. 			printf("%lld\n",ans);
  20. 			continue;
  21. 		}
  22. 		for (i = 0; i < 3; i++) {
  23. 			for (j = 0; j < 3; j++) {
  24. 				dp[i][j] = 1;
  25. 			}
  26. 		}
  27. 		for (i = 3; i <= n; i++) {
  28. 			for (j = 0; j < 3; j++) {
  29. 				for (k = 0; k < 3; k++) {
  30. 					temp[j][k] = 0;
  31. 				}
  32. 			}
  33. 			for (j = 0; j < 3; j++) {
  34. 				for (k = 0; k < 3; k++) {
  35. 					for (cur = 0; cur < 3; cur++) {
  36. 						temp[k][cur] = (temp[k][cur] + dp[j][k]) % MOD;
  37. 					}
  38. 				}
  39. 			}
  40. 			temp[1][2] = (temp[1][2] - dp[0][1] + MOD) % MOD;
  41. 			for (j = 0; j < 3; j++) {
  42. 				for (k = 0; k < 3; k++) {
  43. 					dp[j][k] = temp[j][k];
  44. 				}
  45. 			}
  46. 		}
  47. 		ans = 0;
  48. 		for (i = 0; i < 3; i++) {
  49. 			for (j = 0; j < 3; j++) {
  50. 				ans = (ans + dp[i][j]) % MOD;
  51. 			}
  52. 		}
  53. 		printf("%lld\n",ans);
  54. 	}
  55. 	return 0;
  56. }
Time limit exceeded #stdin #stdout 5s 3140KB
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https://ideone.com/5DrcGX
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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