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/ EvaluateReversePolishNotation.php
Last active
June 19, 2019 22:19
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| <?php | |
| function evaluateReversePolishNotation($expressionArray) | |
| { | |
| $operators = []; | |
| $stack = new SplStack(); | |
| $answer = null; | |
| foreach ($expressionArray as $v) { | |
| if ($v === '+' || $v === '-' || $v === '*' || $v === '/') { | |
| $operand2 = $stack->pop(); |
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| <?php | |
| /** | |
| * Bunch of algorithms including O analysis from the | |
| * Khan Academy course on algorithms. | |
| * | |
| */ | |
| class Algorithms | |
| { |