language: C++11 (gcc-4.7.2)
date: 209 days 14 hours ago
link:
visibility: public 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

#include <iostream>
#include <iterator>
#include <algorithm>
 
int* createSumArray(int* arr, int size)
{
   int ti = 0; // target index
   int* ta = new int[size*(size+1)/2];
   for (int s = 1; s <= size; ++s) // how many elements to sum
   {
      for (int si = 0; si < size + 1 - s; ++si)
      {
          ta[ti] = 0;
          for (int i = si; i < si + s; ++i)
            ta[ti] += arr[i];
          ++ti;
      } 
   }
   return ta;
}
 
void test(int* a, size_t N)
{
  std::copy(a, a + N, std::ostream_iterator<int>(std::cout, ","));
  std::cout << "\n";
  int* ret = createSumArray(a, N);
  std::copy(ret, ret + N*(N+1)/2, std::ostream_iterator<int>(std::cout, ","));
  std::cout << "\n";
  delete [] ret;
}
 
int main() {
  {
    int a[] = {1};
    test(a, sizeof(a)/sizeof(*a));
  }
  {
    int a[] = {1,3,4,5};
    test(a, sizeof(a)/sizeof(*a));
  }
  {
    int a[] = {1,2,3,4,5,6,7,8,9,10};
    test(a, sizeof(a)/sizeof(*a));
  }
}