diff --git a/src/main/java/leetcode/editor/cn/DuiLieDeZuiDaZhiLcof.java b/src/main/java/leetcode/editor/cn/DuiLieDeZuiDaZhiLcof.java new file mode 100644 index 0000000..e2ded86 --- /dev/null +++ b/src/main/java/leetcode/editor/cn/DuiLieDeZuiDaZhiLcof.java @@ -0,0 +1,81 @@ +//请定义一个队列并实现函数 max_value 得到队列里的最大值,要求函数max_value、push_back 和 pop_front 的均摊时间复杂度都 +//是O(1)。 +// +// 若队列为空,pop_front 和 max_value 需要返回 -1 +// +// 示例 1: +// +// 输入: +//["MaxQueue","push_back","push_back","max_value","pop_front","max_value"] +//[[],[1],[2],[],[],[]] +//输出: [null,null,null,2,1,2] +// +// +// 示例 2: +// +// 输入: +//["MaxQueue","pop_front","max_value"] +//[[],[],[]] +//输出: [null,-1,-1] +// +// +// +// +// 限制: +// +// +// 1 <= push_back,pop_front,max_value的总操作数 <= 10000 +// 1 <= value <= 10^5 +// +// Related Topics 栈 Sliding Window +// 👍 248 👎 0 + +package leetcode.editor.cn; + +//剑指 Offer 59 - II:队列的最大值 +public class DuiLieDeZuiDaZhiLcof { + public static void main(String[] args) { + //测试代码 +// Solution solution = new DuiLieDeZuiDaZhiLcof().new Solution(); + } + + //力扣代码 + //leetcode submit region begin(Prohibit modification and deletion) + class MaxQueue { + int[] arr = new int[20000]; + int start = 0, end = 0; + + public MaxQueue() { + + } + + public int max_value() { + int ans = -1; + for (int i = start; i != end; ++i) { + ans = Math.max(ans, arr[i]); + } + return ans; + } + + public void push_back(int value) { + arr[end++] = value; + } + + public int pop_front() { + if (start == end) { + return -1; + } + return arr[start++]; + } + } + +/** + * Your MaxQueue object will be instantiated and called as such: + * MaxQueue obj = new MaxQueue(); + * int param_1 = obj.max_value(); + * obj.push_back(value); + * int param_3 = obj.pop_front(); + */ +//leetcode submit region end(Prohibit modification and deletion) + +} \ No newline at end of file diff --git a/src/main/java/leetcode/editor/cn/DuiLieDeZuiDaZhiLcof.md b/src/main/java/leetcode/editor/cn/DuiLieDeZuiDaZhiLcof.md new file mode 100644 index 0000000..6d4fffd --- /dev/null +++ b/src/main/java/leetcode/editor/cn/DuiLieDeZuiDaZhiLcof.md @@ -0,0 +1,29 @@ +<p>请定义一个队列并实现函数 <code>max_value</code> 得到队列里的最大值,要求函数<code>max_value</code>、<code>push_back</code> 和 <code>pop_front</code> 的<strong>均摊</strong>时间复杂度都是O(1)。</p> + +<p>若队列为空,<code>pop_front</code> 和 <code>max_value</code> 需要返回 -1</p> + +<p><strong>示例 1:</strong></p> + +<pre><strong>输入:</strong> +["MaxQueue","push_back","push_back","max_value","pop_front","max_value"] +[[],[1],[2],[],[],[]] +<strong>输出: </strong>[null,null,null,2,1,2] +</pre> + +<p><strong>示例 2:</strong></p> + +<pre><strong>输入:</strong> +["MaxQueue","pop_front","max_value"] +[[],[],[]] +<strong>输出: </strong>[null,-1,-1] +</pre> + +<p> </p> + +<p><strong>限制:</strong></p> + +<ul> + <li><code>1 <= push_back,pop_front,max_value的总操作数 <= 10000</code></li> + <li><code>1 <= value <= 10^5</code></li> +</ul> +<div><div>Related Topics</div><div><li>栈</li><li>Sliding Window</li></div></div>\n<div><li>👍 248</li><li>👎 0</li></div> \ No newline at end of file