This set TikTok OA To be honest, if you usually have enough questions and are familiar with writing strings and simulations, you can basically get points steadily. This time, the whole process went smoothly. I still had time to check after writing the four questions. Below, I will explain clearly the core ideas of each question + the easy pitfalls.
Question 1: User Rating and Level Determination
After the initial score undergoes a series of increases and decreases, it is mapped to the corresponding level according to the score interval. It is necessary to traverse the changes array to update the rating, and finally use if-elif to determine which range it falls in and return the corresponding string. The complexity is O(n), which meets the requirements. Please ensure that the rating is between 1 and 2500.
Question 2: The bitwise addition of two numeric strings is aligned from right to left.
Add digits starting from the end of the two strings. If a string has no digits, use 0 instead. The result of each addition is directly concatenated as a string, and the final result is arranged starting from the ones digit to the high digit. Note that the addition of the highest bit may produce a carry, which is not reflected in the example, but should be handled correctly. Complexity O(max(len(a), len(b))).
Question 3: The index of the most packages processed by the distribution center
There are multiple centers, each with an initial capacity. When the capacity is full, it is the next one's turn. When "PACKAGE" is encountered, the next available center is found and its capacity is deducted; when "CLOSURE j" is encountered, the center is marked as closed. The capacity of all operating centers is reset at the end of each day. Finally, the processing volume is counted, and the index with the largest processing volume is returned. If there is a parallel index, the highest index is selected. Complexity O(centerCount * dailyLog.length).
Question 4: The minimum number of operations to turn the array into a sequence with an increasing or decreasing step size of 1
Only the value of an element can be increased, with the goal of differing by 1 for each adjacent element. Calculate the minimum number of operations required to become an increasing sequence and a decreasing sequence respectively: starting from fixing the first element to the original value, calculate the required value at each position in steps of 1. If the original value is greater than the required value, it is not feasible; you can also try to adjust the initial value of the first element. Iterates over the possible first element values and takes the smallest operand. The final output is the smaller of the two directions.
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