Leetcode 2118. Build the Equation

Given a sequence of digits/numbers, construct valid mathematical expressions (using concatenation, the four basic operators and optional parentheses) that evaluate to a target value; this is a combinatorial search requiring backtracking with pruning. Key challenges include handling operator precedence/associativity, avoiding invalid forms (e.g., leading zeros, division by zero), and efficiently exploring the exponential space of expressions.

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Leetcode 2118. Build the Equation

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