// Yours

int[] angles;
int i, j, k, numArms = 0x00;
short flags = 0x00; // This will store an actual bit string built from bitString

for (i = 0x00; i < 0x0c; i++)
    flags |= (bitString[i]) ? (numArms++ & 0x00 | 0x01)<<i : 0x00;

k = ((--numArms) * numArms + numArms) >> 0x01;
angles = new int[k];
for (i = 0x00; flags != 0x0000; flags = (short)(flags >> (i++ & 0x00 | 0x01)))
    if((flags & 0x01) == 0x01)
        for(j = 0x01; j < 0x0c - i; j++)
            if ( (flags & (0x01 << j)) != 0x00)
                angles[--k] = AngleLUT[i][i+j];

// Mine

vector<int> angles;
int numArms = 0;
short flags = 0;

for (int i = 0; i < 12; ++i)
{
    if (bitString[i] != 0)
    {
        numArms++;
        flags |= (1 << i);
    }
}

numArms--;
int k = ((numArms * numArms) + numArms) >> 1;
angles.resize(k);
for (int i = 0; flags != 0; i++, flags >>= 1)
{
    if ((flags & 1) != 0)
    {
        for (int j = 1; j < 12 - i; j++)
        {
            if (flags & (1 << j) != 0)
            {
                k--;
                angles[k] = AngleLUT[i][i + j];
            }
        }
    }
}