89 lines
2.3 KiB
Java
89 lines
2.3 KiB
Java
//给定一个整数数据流和一个窗口大小，根据该滑动窗口的大小，计算其所有整数的移动平均值。
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//
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// 实现 MovingAverage 类：
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//
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//
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// MovingAverage(int size) 用窗口大小 size 初始化对象。
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// double next(int val) 计算并返回数据流中最后 size 个值的移动平均值。
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//
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//
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//
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//
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// 示例：
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//
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//
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//输入：
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//["MovingAverage", "next", "next", "next", "next"]
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//[[3], [1], [10], [3], [5]]
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//输出：
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//[null, 1.0, 5.5, 4.66667, 6.0]
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//
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//解释：
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//MovingAverage movingAverage = new MovingAverage(3);
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//movingAverage.next(1); // 返回 1.0 = 1 / 1
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//movingAverage.next(10); // 返回 5.5 = (1 + 10) / 2
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//movingAverage.next(3); // 返回 4.66667 = (1 + 10 + 3) / 3
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//movingAverage.next(5); // 返回 6.0 = (10 + 3 + 5) / 3
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//
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//
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//
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//
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// 提示：
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//
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//
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// 1 <= size <= 1000
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// -10⁵ <= val <= 10⁵
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// 最多调用 next 方法 10⁴ 次
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//
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// Related Topics 设计 队列 数组 数据流 👍 66 👎 0
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package leetcode.editor.cn;
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import java.util.LinkedList;
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import java.util.Queue;
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//346:数据流中的移动平均值
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class MovingAverageFromDataStream {
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public static void main(String[] args) {
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//测试代码
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// Solution solution = new MovingAverageFromDataStream().new Solution();
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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class MovingAverage {
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Queue<Integer> queue;
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int size;
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double sum = 0.0;
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/**
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* Initialize your data structure here.
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*/
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public MovingAverage(int size) {
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queue = new LinkedList<>();
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this.size = size;
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}
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public double next(int val) {
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if (queue.size() >= size) {
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sum += 1.0 * (val - queue.poll()) / size;
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} else {
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if (queue.isEmpty()) {
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sum += val;
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} else {
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sum = (sum * queue.size() + val) / (queue.size() + 1);
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}
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}
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queue.offer(val);
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return sum;
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}
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}
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/**
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* Your MovingAverage object will be instantiated and called as such:
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* MovingAverage obj = new MovingAverage(size);
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* double param_1 = obj.next(val);
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*/
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//leetcode submit region end(Prohibit modification and deletion)
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} |