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fine tune
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@@ -25,7 +25,7 @@ void main() {
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/* 元素出队 */
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final int pop = queue.removeFirst();
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print("出队元素 pop = $pop,出队后 queue = $queue");
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print("出队元素 pop = $pop ,出队后 queue = $queue");
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/* 获取队列长度 */
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final int size = queue.length;
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