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  1. #include<bits/stdc++.h>
  2. #define MASK(i) (1<<(i))
  3. #define BIT(x,i) (((x)>>(i))&1)
  4. using namespace std;
  5. const long long MaxN = 17;
  6. const long long MaxDP = 1<<MaxN;
  7. long long n,a[MaxN],s[MaxDP];
  8. void input()
  9. {
  10.    cin >> n;
  11.    for (long long i=0; i<n; i++)
  12.    {
  13.        cin >> a[i];
  14.    }
  15. }
  16. void solve()
  17. {
  18.  
  19.     // tính tổng mọi tập con của a[0,...,n]
  20.     for (long long i=0; i<n; i++)
  21.     {
  22.         s[MASK(i)]=a[i];
  23.     }
  24.     s[0]=0;
  25.     for (long long mask=1; mask<MASK(n); mask++)
  26.     {
  27.         long long tmp =mask&-mask;
  28.         s[mask]=s[tmp]+s[tmp^mask];
  29.     }
  30.  
  31. }
  32. int main()
  33. {
  34.     ios_base::sync_with_stdio(0);
  35.     cin.tie(0);
  36.     input();
  37.     solve();
  38.     return 0;
  39. }
  40.  
  41.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/TsH8SS
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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