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  1. //never give up  try to code every time
  2. #include<bits/stdc++.h>
  3. #define s(a) scanf("%d",&a)
  4. #define S(a)  scanf("%lld",&a)
  5. #define p(a) puts("a")
  6. #define loop(a) for(int i=0;i<a;i++)
  7. #define mx(x,y) x>y?x:y
  8. #define mn(x,y) x>y?y:x
  9. #define lld long long
  10. #define ld long
  11. #define max 100005
  12. #define pb(a)  push_back(a)
  13. #define pp(a) pop_back(a)
  14. #define code_lover int main
  15. using namespace std;
  16. long long int n=4000;
  17. long long int r=4000;
  18. vector< vector<long long int > > C(n+1,vector<long long int > (r+1,0));
  19. const int MOD=1e+7;
  20. inline void c(long int n, long int r, long int MOD)
  21. {
  22.  
  23.  
  24.     for (long  int i=0; i<=n; i++)
  25.     {
  26.         for (long  int k=0; k<=r && k<=i; k++)
  27.             if (k==0 || k==i)
  28.                 C[i][k] = 1;
  29.             else
  30.                 C[i][k] = (C[i-1][k-1] + C[i-1][k])%MOD;
  31.     }
  32. }
  33. int pow2[100000];
  34. inline void pow_two()
  35. {pow2[0]=1;
  36. pow2[1]=2;
  37. for(int i=2;i<100000;i++)
  38. 	pow2[i]=(2*pow2[i-1])%MOD;
  39.  
  40.  
  41. }
  42. code_lover()
  43. {c(n,r,MOD);
  44. pow_two();
  45. int t;
  46. scanf("%d",&t);
  47. while(t--)
  48. {int n,q,i,k;
  49.   scanf("%d%d",&n,&q);
  50. while(q--)
  51. {scanf("%d%d",&i,&k);
  52. if(k>i)
  53.   puts("0");
  54.   else
  55.   {
  56.   	int ans=(C[i-1][k-1]%MOD)*pow2[n-i]%MOD;
  57.   	printf("%d\n",ans%MOD);
  58.   }
  59.  
  60. }
  61.  
  62.  
  63. }
  64.  
  65. return 0;
  66. }
Runtime error #stdin #stdout 0.43s 128832KB
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https://ideone.com/gNUzaa
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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