Exclusive Execution Time of Functions

Try to solve the Exclusive Execution Time of Functions problem.


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 00 and n1n-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 specific function.


  • 11 \leq n 100\leq 100
  • 11 \leq logs.length 500\leq 500
  • 00 \leq function id << n
  • 00 \leq timestamp 103\leq 10^3
  • No two start events and two end events will happen at the same timestamp.
  • Each function has an end log entry for each start log entry.


Each function is identified in the logs by a function id. Each log entry is formatted in the following way:

{function id}:{"start" | "end"}:{timestamp}

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