Write T(n) and big-O expressions for the following loops. Briefly explain how you calculated T(n). For (int i = 0; i < n; i++) for (int j = 0; j < i * i; j++) cout << j << endl; for (int i = n; i > = 0; i - = 2) cout << i << endl; for (int i = 0; i < n; i++) for (int j = i; j > 0; j/= 2) cout << j << endl;