{"id":1005,"date":"2025-12-18T02:12:14","date_gmt":"2025-12-17T18:12:14","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=1005"},"modified":"2025-12-18T02:12:14","modified_gmt":"2025-12-17T18:12:14","slug":"leetcode-169-%e5%a4%9a%e6%95%b0%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=1005","title":{"rendered":"LeetCode 169 &#8211; \u591a\u6570\u5143\u7d20"},"content":{"rendered":"<h1>\u9898\u76ee\u63cf\u8ff0<\/h1>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u5927\u5c0f\u4e3a n \u7684\u6570\u7ec4 nums \uff0c\u8fd4\u56de\u5176\u4e2d\u7684\u591a\u6570\u5143\u7d20\u3002\u591a\u6570\u5143\u7d20\u662f\u6307\u5728\u6570\u7ec4\u4e2d\u51fa\u73b0\u6b21\u6570 \u5927\u4e8e \u230a n\/2 \u230b \u7684\u5143\u7d20\u3002<br \/>\n\u4f60\u53ef\u4ee5\u5047\u8bbe\u6570\u7ec4\u662f\u975e\u7a7a\u7684\uff0c\u5e76\u4e14\u7ed9\u5b9a\u7684\u6570\u7ec4\u603b\u662f\u5b58\u5728\u591a\u6570\u5143\u7d20\u3002<\/p>\n<h1>\u9898\u76ee\u5206\u6790<\/h1>\n<p>\u904d\u5386\u6570\u7ec4\u65f6\uff0c\u5bf9\u5386\u53f2\u4e0a\u7684\u5047\u5b9a\u4f17\u6570\u8ba1\u6570 count\uff0c\u76f8\u540c+1 \u76f8\u5f02-1\uff0ccount \u53d8\u4e3a0\u5219\u91cd\u65b0\u5047\u5b9a\u4f17\u6570\u3002<br \/>\n\u7531\u4e8e\u76ee\u6807\u6570\u5b57\u51fa\u73b0\u6b21\u6570\u4e00\u5b9a\u5927\u4e8e n\/2\uff0c\u6240\u4ee5\u6700\u7ec8\u7684\u5047\u5b9a\u503c\u5c31\u662f\u7b54\u6848\u3002<br \/>\n\u65f6\u95f4\u590d\u6742\u5ea6 O(n)\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6 O(1)<\/p>\n<h1>Java<\/h1>\n<pre><code class=\"language-java line-numbers\">public int majorityElement(int[] nums) {\n    int count = 0, ans = 0;\n    for (int num : nums) {\n        if (count == 0) {\n            ans = num;\n        }\n        if (num == ans) {\n            count++;\n        } else {\n            count--;\n        }\n    }\n    return ans;\n}\n<\/code><\/pre>\n<h1>Kotlin<\/h1>\n<pre><code class=\"language-kotlin line-numbers\">fun majorityElement(nums: IntArray): Int {\n    var ans = 0\n    var count = 0\n    for (num in nums) {\n        if (count == 0) {\n            ans = num\n        }\n        count += if (num == ans) 1 else -1\n    }\n    return ans\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u63cf\u8ff0 \u7ed9\u5b9a\u4e00\u4e2a\u5927\u5c0f\u4e3a n \u7684\u6570\u7ec4 nums \uff0c\u8fd4\u56de\u5176\u4e2d\u7684\u591a\u6570\u5143\u7d20\u3002\u591a\u6570\u5143\u7d20\u662f\u6307\u5728\u6570\u7ec4\u4e2d\u51fa\u73b0\u6b21\u6570 \u5927\u4e8e \u230a  [&hellip;]<\/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":[20,92,93],"class_list":["post-1005","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-92","tag-93"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1005","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=1005"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1005\/revisions"}],"predecessor-version":[{"id":1006,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1005\/revisions\/1006"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}