Exclusive Time of Functions

Explore how to compute the exclusive time of functions running on a single-threaded CPU using stack data structures. Learn to interpret execution logs with start and end timestamps, handle function preemption, and implement a solution to determine total runtime per function. This lesson builds your skills in analyzing complex timing problems common in coding interviews.

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We are given an integer number, n, representing the number of functions running in a single-threaded CPU, and an execution log, which is essentially a list of strings. Each string has the format {function id}:{"start" | "end"}:{timestamp}, indicating that the function with function id either started or stopped execution at the time identified by the timestamp value. Each function has a unique ID between $0$ and $n-1$ . Compute the exclusive time of the functions in the program.

Note: The exclusive time is the sum of the execution times for all the calls to a ...