Discovering Infinite Loops, Handling Custom Iteration, Error handling, Debugging, Testing

Problem

Input: a string containing a sequence of commands separated by semicolons; each command is one of:

"ADD x" (add integer x to a running total),

"MUL x" (multiply running total by x),

"IFZERO goto n" (if running total == 0, jump to the nth command, 1-based),

"PRINT" (append current total to output).

Commands may have extra spaces; ignore blank commands; invalid commands should cause an error with a helpful message.

Output: list of printed integers in order, or an error if a jump targets an invalid line or a command is malformed.

Constraints: input length up to ~10k characters, values fit in 64-bit signed.

Why this tests problem-solving

Requires tokenizing and robust parsing (trimming, splitting, number parsing).

Needs control-flow handling (jumps), loop detection/termination care.

Shows use of Kotlin features: sealed classes, data classes, when, extension functions, exception handling, and idiomatic collection usage.

Видео Discovering Infinite Loops, Handling Custom Iteration, Error handling, Debugging, Testing канала Dr Priyanthi Dassanayake