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  1. /*--.--.--.--.--.--.--.--.--.--.--.--.--*
  2.  *  	By-Rohit Singh					 *
  3.  *    CS , MNNIT Allahabad               *
  4.  *		rohitmnnit1459@gmail.com         *
  5.  *--.--.--.--.--.--.--.--.--.--.--.--.--*/
  6.  
  7. #include <iostream>
  8. #include <cstdio>
  9. #include <vector>
  10. #include <map>
  11. #include <queue>
  12. #include <stack>
  13. #include <cstring>
  14. #include <algorithm>
  15. #include <cstdlib>
  16. #include <cmath>
  17. #include <set>
  18. #include <limits.h>
  19. #include <assert.h>
  20. //#include <unordered_map> 
  21. using namespace std;
  22.  
  23. #define mp make_pair
  24. #define pb push_back
  25. #define X first
  26. #define Y second
  27. #define null NULL
  28. #define ll long long
  29. #define llu unsigned long long
  30. #define MAX 2300000
  31. #define mod 100000007
  32. #define inf 100000000
  33. #define pp pair <int, int>
  34.  
  35. typedef double db;
  36. typedef long double ldb;
  37. typedef pair <int, int> pii;
  38. typedef pair <ll, ll> pll;
  39. typedef pair <ll, int> pli;
  40. typedef pair <ldb, ldb> pdd;
  41.  
  42. const db PI = 3.141592653589793238;
  43. #define abs(x) ((x)>0?(x):-(x))
  44. #define pop pop_back()
  45. #define scan(x) scanf("%d",&x)
  46. #define print(x) printf("%d\n",x)
  47. #define scanll(x) scanf("%lld",&x)
  48. #define printll(x) printf("%lld\n",x)
  49. //**********************************************HAPPY CODDING*****************************************************/
  50. double dp[4005][4000];
  51.  
  52. void ini()  {
  53. 	int i, j;
  54. 	for (i = 0 ; i <= 750 ; i++)  {
  55. 		for (j = 0 ; j <= 3500 ; j++)  {
  56. 			dp[i][j] = -1;
  57. 		}
  58. 	}
  59. }
  60. double faverable(int sum, int ind)  {
  61.  
  62. 	if (sum < ind || sum > ind*6)  {
  63. 		return 0;
  64. 	}
  65. 	if (dp[sum][ind] != -1)  {
  66. 		return dp[sum][ind];
  67. 	}
  68. 	if (ind == 1)  {
  69. 		dp[sum][ind] = (double)100/6.0;
  70. 	}
  71. 	else  {
  72. 		double ans = 0;
  73. 		for (int i = 1 ; i <= 6 ; i++)  {
  74. 			ans += faverable(sum-i, ind-1);
  75. 		}
  76. 		dp[sum][ind] = (double)ans/6.0;
  77. 	}	
  78. 	return dp[sum][ind];
  79. }
  80. int main()  {
  81.  
  82. 	int t, n, k;
  83. 	ll kk;
  84. 	scanf("%d", &t);
  85. 	while (t--)  {
  86. 		ini();
  87. 		scanf("%d %d", &n, &k);
  88. 		if (k < n || k > n*6 || n > 600 || k > 3500)  {
  89. 			printf("0\n");
  90. 			continue;
  91. 		}
  92. 		kk = (ll)faverable(k, n);
  93. 		printf("%lld\n", kk);
  94. 	}
  95. 	return 0;
  96. }
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https://ideone.com/0fOUqn
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
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