I am still uncertain about the method of calculating time complexity.

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Calculating time complexity involves analyzing the efficiency of an algorithm in terms of the amount of time it takes to complete a task as the input size increases. The analysis involves looking at the number of operations performed by the algorithm and how that number changes as the input size increases.

To calculate time complexity, you could follow these steps:

1. Identify the basic operations of the algorithm.
2. Determine the number of times each basic operation is executed based on the input size.
3. Express the number of operations as a mathematical function of the input size.
4. Simplify the function by removing constants and lower-order terms.
5. Determine the dominant term of the simplified function, which gives the time complexity of the algorithm.

For example, consider the following algorithm to find the maximum number in a list of n numbers:

max = a[0]
for i in range(1, n):
    if a[i] > max:
        max = a[i]

1. The basic operations are assignment and comparison.
2. The assignment operation is executed once. The comparison operation is executed n-1 times in the worst case.
3. The number of operations is T(n) = 2(n-1) + 1.
4. Simplifying the function, we get T(n) = 2n - 1.
5. The dominant term is 2n, so the time complexity of the algorithm is O(n).

In summary, time complexity is a measure of an algorithm's efficiency in terms of the amount of time it takes to complete a task as the input size increases. By following the steps above, you could calculate the time complexity of different algorithms and compare their performance.