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  1. #include <bits/stdc++.h>
  2. #include <map>
  3. #define Fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
  4. using namespace std;
  5. typedef long long ll;
  6. typedef unsigned long long ull;
  7. int dx[]={-1,1,-1,1};
  8. int dy[]={-1,-1,1,1};
  9. const int mod=1e9+7 ,nn=1005;
  10. int fact[nn];
  11. void factorial() {
  12.     fact[0] = 1;
  13.     for (int i = 1; i <= nn; i++) {
  14.         fact[i] =1ll * fact[i-1] * i %mod;
  15.         //factorial%=mod;
  16.     }
  17. }
  18. int fastpow(int b,int p)
  19. {
  20.     if(p==1)return b;
  21.     int halfpower= fastpow(b,p/2);
  22.     int ret=(halfpower*halfpower)%mod;
  23.     if(p&1) ret=(ret*b)%mod;
  24.     return ret%mod;
  25. }
  26. int modFastPower(int b,int p,int mod)
  27. {
  28.     if(p==1)return b;
  29.     int halfpower= modFastPower(b,p/2,mod);
  30.     int ret=(halfpower*halfpower)%mod;
  31.     if(p%2)
  32.         ret=(ret*b)%mod;
  33.     return (ret+mod)%mod;
  34. }
  35. int fp(int b,int p)
  36. {
  37.     if(p==0)return 1;
  38.     int ans=fp(b*b%mod,p/2);
  39.     if(p&1)
  40.     return 1ll* ans*b%mod;
  41.     return ans%mod;
  42. }
  43. int modInvFermat(int c,int m)
  44. {
  45.     return modFastPower(c,m-2,m);
  46. }
  47.  
  48. int nCr(int n, int r) {
  49.     return 1ll * fact[n]* fp(1ll *fact[r]*fact[n-r]%mod,mod-2)%mod;
  50. }
  51. int main() {
  52.     Fast;
  53.     factorial();
  54.     cout<<fp(50,4)<<endl;
  55.     cout<<nCr(100,3)<<endl;
  56. //    freopen("input.txt", "r", stdin);
  57. int n,k,t,mx,mxx;
  58. cin>>t;
  59. while(t--)
  60. {
  61.     cin>>n>>k;
  62.     vector<int>vec(n);
  63.     mx=0,mxx=1;
  64.     map<int,int>total,part;
  65.     for(int i=0; i<n; i++)
  66.     {
  67.         cin>>vec[i];
  68.         total[vec[i]]++;
  69.     }
  70.     sort(vec.rbegin(),vec.rend());
  71.     for(int i=0; i<k; i++)
  72.     {
  73.         mx+=vec[i];
  74.         part[vec[i]]++;
  75.     }
  76.     for(int i=0; i<k; i++)
  77.     {
  78.         if(part[vec[i]]<total[vec[i]])
  79.         {
  80.             mxx=nCr(total[vec[i]],part[vec[i]]);
  81.         }
  82.     }
  83.     cout<<mxx<<endl;
  84. }
  85. }
Success #stdin #stdout 1.13s 5472KB
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https://ideone.com/a9hog8
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

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