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  1. #include <iostream>
  2. #include <vector>
  3. #include <numeric>
  4. #include <iomanip>
  5.  
  6. std::vector<std::vector<int> > sums(int array[], int size)
  7. {
  8.         std::vector<std::vector<int> > result(size - 1);
  9.         //build the two element sums
  10.         for(int *p = array; p - array < size - 1; ++p)
  11.                 result[0].push_back(std::accumulate(p, p + 2, 0));
  12.         //build the rest of the sums
  13.         for(int i = 1; i < size - 1; ++i)
  14.                 for(int j = 0; j < size - (i + 1); ++j)
  15.                         result[i].push_back(result[i - 1][j] + array[i + j + 1]);
  16.         return result;
  17. }
  18.  
  19. int main()
  20. {
  21.         int array[] = {1, 2, 3, 4, 5};
  22.         for(int i = 0; i < sizeof(array)/sizeof(*array); ++i)
  23.         {
  24.                 std::cout << std::setw(3) << array[i];
  25.         }
  26.         std::cout << std::endl;
  27.         std::vector<std::vector<int> > v = sums(array, sizeof(array)/sizeof(*array));
  28.         for(int i = 0; i < v.size(); ++i)
  29.         {
  30.                 for(int j = 0; j < v[i].size(); ++j)
  31.                         std::cout << std::setw(3) << v[i][j];
  32.                 std::cout << std::endl;
  33.         }
  34. }
Success #stdin #stdout 0.02s 2860KB
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https://ideone.com/xdaZP4
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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