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Evaluate Sequential Variable Assignments

Google● HardINTERNONSITE INTERVIEW

Problem statement

Process assignments in order. Assignment i evaluates expressions[i] using the current variable values, then stores the result in the variable names[i]. Return the value produced by each assignment.

An expression contains nonnegative decimal integer literals, lowercase variable names, optional unary + or - before an operand, and binary +, -, *, and /. Spaces may appear between tokens. Parentheses are absent.

The problem statement continues

Pro

Examples

Example 1

names = ["a","b","c"]expressions = ["2 + 3 * 4","a / 3","b * -2 + a"]return = [14,4,6]

a is 14, b is 14 / 3 = 4, and c is 4 * -2 + 14 = 6.

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