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Parse and evaluate a nested ternary expression string (with single-character operands and '?' and ':' operators), respecting the ternary operator's right-to-left associativity, and return the final resulting value. The core challenge is correctly handling arbitrary nesting and precedence, commonly approached with a right-to-left scan using a stack or recursive parsing.
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Leetcode 439. Ternary Expression Parser
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Source snapshot: Nov 12, 2026
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