{"id":1021,"date":"2025-12-24T01:47:51","date_gmt":"2025-12-23T17:47:51","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=1021"},"modified":"2025-12-24T01:47:51","modified_gmt":"2025-12-23T17:47:51","slug":"leetcode-295-%e6%95%b0%e6%8d%ae%e6%b5%81%e7%9a%84%e4%b8%ad%e4%bd%8d%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=1021","title":{"rendered":"LeetCode 295 \u2013 \u6570\u636e\u6d41\u7684\u4e2d\u4f4d\u6570"},"content":{"rendered":"

\u9898\u76ee\u63cf\u8ff0<\/h1>\n

\u4e2d\u4f4d\u6570\u662f\u6709\u5e8f\u6574\u6570\u5217\u8868\u4e2d\u7684\u4e2d\u95f4\u503c\u3002\u5982\u679c\u5217\u8868\u7684\u5927\u5c0f\u662f\u5076\u6570\uff0c\u5219\u6ca1\u6709\u4e2d\u95f4\u503c\uff0c\u4e2d\u4f4d\u6570\u662f\u4e24\u4e2a\u4e2d\u95f4\u503c\u7684\u5e73\u5747\u503c\u3002
\n\u4f8b\u5982 arr = [2,3,4] \u7684\u4e2d\u4f4d\u6570\u662f 3 \u3002
\n\u4f8b\u5982 arr = [2,3] \u7684\u4e2d\u4f4d\u6570\u662f (2 + 3) \/ 2 = 2.5 \u3002
\n\u5b9e\u73b0 MedianFinder \u7c7b:
\nMedianFinder() \u521d\u59cb\u5316 MedianFinder \u5bf9\u8c61\u3002
\nvoid addNum(int num) \u5c06\u6570\u636e\u6d41\u4e2d\u7684\u6574\u6570 num \u6dfb\u52a0\u5230\u6570\u636e\u7ed3\u6784\u4e2d\u3002
\ndouble findMedian() \u8fd4\u56de\u5230\u76ee\u524d\u4e3a\u6b62\u6240\u6709\u5143\u7d20\u7684\u4e2d\u4f4d\u6570\u3002\u4e0e\u5b9e\u9645\u7b54\u6848\u76f8\u5dee 10-5 \u4ee5\u5185\u7684\u7b54\u6848\u5c06\u88ab\u63a5\u53d7\u3002<\/p>\n

\u9898\u76ee\u5206\u6790<\/h1>\n

\u4f7f\u7528\u4e24\u4e2a\u4f18\u5148\u961f\u5217\uff0c\u4e00\u4e2a\u5927\u9876\u5b58\u50a8\u5de6\u4fa7\u6570\u636e\uff0c\u4e00\u4e2a\u5c0f\u9876\u5b58\u50a8\u53f3\u4fa7\u6570\u636e\u3002
\n\u63d2\u5165\u6570\u636e\u65f6\uff0c\u6839\u636e\u5927\u5c0f\u51b3\u5b9a\u63d2\u5165\u5de6\u4fa7\u8fd8\u662f\u53f3\u4fa7\u3002\u7136\u540e\u518d\u5bf9\u4e24\u4e2a\u961f\u5217\u5143\u7d20\u7684\u6570\u91cf\u505a\u5e73\u8861\uff08\u5dee\u8ddd\u8d85\u8fc72\uff09\u3002
\n\u63d2\u5165\u6570\u636e\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(log n)\uff0c\u8bfb\u53d6\u4e2d\u4f4d\u6570\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(1)<\/p>\n

Java<\/h1>\n
private Queue<Integer> left = new PriorityQueue<>((o1, o2) -> Integer.compare(o2, o1));\nprivate Queue<Integer> right = new PriorityQueue<>();\n\npublic MedianFinder() {\n\n}\n\npublic void addNum(int num) {\n    if (right.isEmpty()) {\n        right.offer(num);\n        return;\n    }\n    if (num > right.peek()) {\n        right.offer(num);\n        if (right.size() > left.size() + 1) {\n            left.offer(right.poll());\n        }\n    } else {\n        left.offer(num);\n        if (left.size() > right.size() + 1) {\n            right.offer(left.poll());\n        }\n    }\n}\n\npublic double findMedian() {\n    if (left.size() > right.size()) {\n        return (double) left.peek();\n    } else if (left.size() < right.size()) {\n        return (double) right.peek();\n    } else {\n        return (left.peek() + right.peek()) \/ 2.0;\n    }\n}\n<\/code><\/pre>\n
Kotlin<\/h1>\n
private val left = PriorityQueue<Int> { o1, o2 -> Integer.compare(o2, o1) }\nprivate val right = PriorityQueue<Int>()\n\nfun addNum(num: Int) {\n    if (left.isEmpty()) {\n        left.offer(num)\n        return\n    }\n    if (num < left.peek()) {\n        left.offer(num)\n        if (left.size > right.size + 1) {\n            right.offer(left.poll())\n        }\n    } else {\n        right.offer(num)\n        if (right.size > left.size + 1) {\n            left.offer(right.poll())\n        }\n    }\n}\n\nfun findMedian(): Double {\n    if (left.size > right.size) {\n        return left.peek().toDouble()\n    } else if (left.size < right.size) {\n        return right.peek().toDouble()\n    } else {\n        return (left.peek() + right.peek()) \/ 2.0\n    }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\u63cf\u8ff0 \u4e2d\u4f4d\u6570\u662f\u6709\u5e8f\u6574\u6570\u5217\u8868\u4e2d\u7684\u4e2d\u95f4\u503c\u3002\u5982\u679c\u5217\u8868\u7684\u5927\u5c0f\u662f\u5076\u6570\uff0c\u5219\u6ca1\u6709\u4e2d\u95f4\u503c\uff0c\u4e2d\u4f4d\u6570\u662f\u4e24\u4e2a\u4e2d\u95f4\u503c\u7684\u5e73\u5747\u503c\u3002 \u4f8b […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[20,79,51],"class_list":["post-1021","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-79","tag-51"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1021","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1021"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1021\/revisions"}],"predecessor-version":[{"id":1022,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1021\/revisions\/1022"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1021"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1021"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}