Command Frequency Counter

Problem Overview

• Count occurrences of cmd1, cmd2, and cmd3 in a command array, resolving any ![index] to the command at that 1-based position.
• Input: String[] commands; Output: int[3] = [freq(cmd1), freq(cmd2), freq(cmd3)]; only three valid commands.
• Domain: command log parsing where entries may reference earlier commands.
• This coding interview problem is an Uber interview question.