function solution(operations) {
    var queue = [];
    
    operations.forEach((op) => {
        const [command, val] = op.split(' ')
        if (command === "I") {
            // Number로 변환
            queue.push(val * 1)
        }
        else if (command === 'D' && queue.length) {
          queue.sort((a, b) => a - b)
          val === '1' ? queue.pop() : queue.shift()
        }
    })
        
    queue.sort((a, b) => a - b)
    return queue.length ? [queue[queue.length-1], queue[0]] : [0, 0];
}