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sequence longest_increasing_powerset(const sequence& A) { const size_t n = A.size(); sequence best; std:

sequence longest_increasing_powerset(const sequence& A) {

  const size_t n = A.size();

  sequence best;

  std::vector<size_t> stack(n+1, 0);

  size_t k = 0;

  while (true) {

     

    if (stack[k] < n) {

      stack[k+1] = stack[k] + 1;

      ++k;

    } else {

      stack[k-1]++;

      k--;

    }

     

    if (k == 0) {

      break;

    }

     

    sequence candidate;

    for (size_t i = 1; i <= k; ++i) {

      candidate.push_back(A[stack[i]-1]);

    }

    // TODO

    // write the if statement to test whether candidate determines

    // an increasing sequence AND has a size larger than the size

    // of the current best

    // if both conditions are satisfied, then stored candidate in best

     

  }

   

  return best;

}

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