Algorithm · Google · Hard
You are given a sequence of integers and a target value. Your task is to insert the operators '+', '', and parentheses '(', ')'—only where they are strictly needed—to build a valid arithmetic expression that evaluates to the target. Standard precedence rules apply: expressions inside parentheses are evaluated first, followed by multiplication, and then addition. The original order of the numbers must be preserved. Operators may be placed between any two numbers. If a…