Resolve a Variable Through Literal and Reference Assignments

Resolve a variable whose assignment is either an integer literal or the name of another variable. ### Function Signature `resolve_variable(assignments: list[list[str]], target: str) -> int` ### Input Each assignment is `[variable_name, right_hand_side]`. A right-hand side is either a decimal integer literal or another variable name. The order of assignments is arbitrary. For this exercise, names match `[A-Za-z_][A-Za-z0-9_]*`. Integer literals use an optional minus sign followed by one or more digits, with no whitespace or plus sign. Literal values are in `[-1000000000, 1000000000]`. ### Output Follow references beginning at `target` and return the terminal integer value. ### Constraints - `1 <= len(assignments) <= 100000`. - Variable names are unique, and `target` is defined. - Every referenced variable is defined. - The complete reference graph is acyclic, so every chain ends in an integer literal. - Each string has at most 40 characters. - These validity rules are explicit baseline assumptions; malformed definitions and cycles are outside this console contract. ### Examples Input: `assignments = [["T1","T2"],["T2","-8"],["unused","4"]], target = "T1"` Output: `-8` Input: `assignments = [["A","007"],["B","A"]], target = "B"` Output: `7` Input: `assignments = [["value","0"]], target = "value"` Output: `0`