CSC300: What's the result? [4/13]

    for (long i = N; i > 0; i = i-1) {
      for (long j = N; j > 0; j = j-1) {
        result = result+1;
      }
    }

Choices:

1. independent of N -- constant
2. ~ lg N -- logarithmic
3. ~ (lg N)^2 -- log squared
4. ~ N -- linear
5. ~ 2N -- linear
6. ~ N(lg N) -- linearithmic
7. ~ (N^2)/2 -- quadratic
8. ~ N^2 -- quadratic
9. ~ N^3 -- cubic
10. ~ 2^N -- exponential