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Feat: 연결 리스트, 스택, 큐 같은 숫자는 싫어(12906)
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function solution(arr) {
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const stack = [];
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arr.forEach(number => {
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if(stack.length && stack[stack.length-1] === number) {
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stack.pop();
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}
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stack.push(number);
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})
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return stack;
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}

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