{"id":65447,"date":"2025-05-03T16:30:19","date_gmt":"2025-05-03T08:30:19","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65447\/"},"modified":"2025-05-03T16:30:19","modified_gmt":"2025-05-03T08:30:19","slug":"java%e6%95%b0%e7%bb%84%e7%9a%84mex%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65447\/","title":{"rendered":"Java\u6570\u7ec4\u7684mex\u600e\u4e48\u7528"},"content":{"rendered":"<blockquote><p>\n  java \u6570\u7ec4\u7684 mex\uff08minimum excluded value\uff09\u662f\u6570\u7ec4\u4e2d\u6ca1\u6709\u51fa\u73b0\u7684\u6700\u5c0f\u975e\u8d1f\u6574\u6570\u3002\u8ba1\u7b97 mex \u7684\u6b65\u9aa4\uff1a\u521b\u5efa\u5e03\u5c14\u6570\u7ec4 exists\uff0c\u957f\u5ea6\u4e3a\u6570\u7ec4\u957f\u5ea6\u52a0 1\u3002\u904d\u5386\u6570\u7ec4\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u975e\u8d1f\u6570\u5c06\u5176\u5728 exists \u4e2d\u6807\u8bb0\u4e3a true\u3002\u904d\u5386 exists \u6570\u7ec4\uff0c\u8fd4\u56de\u7b2c\u4e00\u4e2a\u503c\u4e3a false \u7684\u7d22\u5f15\u4f5c\u4e3a mex\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111301100036525.jpg\" class=\"aligncenter\" title=\"Java\u6570\u7ec4\u7684mex\u600e\u4e48\u7528\u63d2\u56fe\" alt=\"Java\u6570\u7ec4\u7684mex\u600e\u4e48\u7528\u63d2\u56fe\" \/><\/p>\n<p><strong>Java \u6570\u7ec4\u7684 MEX \u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<p>MEX\uff08Minimum Excluded Value\uff09\u662f\u6570\u7ec4\u4e2d\u6ca1\u6709\u51fa\u73b0\u7684\u6700\u5c0f\u975e\u8d1f\u6574\u6570\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u6570\u7ec4 [2, 3, 5, 7]\uff0cMEX \u4e3a 0\uff0c\u56e0\u4e3a 0 \u5230 7 \u7684\u6240\u6709\u6574\u6570\u90fd\u51fa\u73b0\u5728\u6570\u7ec4\u4e2d\u3002<\/p>\n<p><strong>\u5982\u4f55\u8ba1\u7b97 MEX\uff1f<\/strong><\/p>\n<p>Java \u4e2d\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6b65\u9aa4\u8ba1\u7b97 MEX\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>public static int findMex(int[] arr) {\n    boolean[] exists = new boolean[arr.length + 1]; \/\/ \u8bb0\u5f55\u6570\u7ec4\u4e2d\u5b58\u5728\u7684\u5143\u7d20\n    \n    for (int num : arr) {\n        if (num &gt;= 0 &amp;&amp; num &lt; exists.length) {\n            exists[num] = true;\n        }\n    }\n    \n    for (int i = 0; i &lt; exists.length; i++) {\n        if (!exists[i]) {\n            return i; \/\/ \u627e\u5230\u7b2c\u4e00\u4e2a\u4e0d\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\u7684\u975e\u8d1f\u6574\u6570\n        }\n    }\n    \n    return exists.length; \/\/ \u5982\u679c\u6570\u7ec4\u4e2d\u4e0d\u5b58\u5728 MEX\uff0c\u5219\u8fd4\u56de\u6570\u7ec4\u957f\u5ea6\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4e3e\u4e2a\u4f8b\u5b50<\/strong><\/p>\n<p>\u5bf9\u4e8e\u6570\u7ec4 [2, 3, 5, 7]\uff0c\u8ba1\u7b97 MEX \u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u521b\u5efa\u4e00\u4e2a\u5e03\u5c14\u6570\u7ec4 exists\uff0c\u957f\u5ea6\u4e3a\u6570\u7ec4\u957f\u5ea6\u52a0 1\uff0c\u8868\u793a\u662f\u5426\u5b58\u5728\u975e\u8d1f\u6574\u6570\u3002<\/li>\n<li>\u904d\u5386\u6570\u7ec4\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u6570\u5b57 num\uff0c\u5982\u679c\u5b83\u975e\u8d1f\u5e76\u4e14\u5c0f\u4e8e\u5e03\u5c14\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u5219\u5c06 exists[num] \u8bbe\u4e3a true\u3002<\/li>\n<li>\u904d\u5386 exists \u6570\u7ec4\uff0c\u627e\u5230\u7b2c\u4e00\u4e2a\u503c\u4e3a false \u7684\u7d22\u5f15\uff0c\u8fd4\u56de\u8be5\u7d22\u5f15\u4f5c\u4e3a MEX\u3002<\/li>\n<\/ol>\n<p>\u5728\u672c\u4f8b\u4e2d\uff0cexists \u6570\u7ec4\u4e3a\uff1a[true, false, true, true, true, true, true, true]\u3002\u7b2c\u4e00\u4e2a\u503c\u4e3a false \u7684\u7d22\u5f15\u4e3a 1\uff0c\u56e0\u6b64 MEX \u4e3a 1\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fJava\u6570\u7ec4\u7684mex\u600e\u4e48\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java \u6570\u7ec4\u7684 mex\uff08minimum excluded value\uff09\u662f\u6570\u7ec4\u4e2d\u6ca1\u6709\u51fa\u73b0\u7684\u6700\u5c0f\u975e\u8d1f\u6574\u6570\u3002\u8ba1\u7b97 mex \u7684\u6b65\u9aa4\uff1a\u521b\u5efa\u5e03\u5c14\u6570\u7ec4 exists\uff0c\u957f\u5ea6\u4e3a\u6570\u7ec4\u957f\u5ea6\u52a0 1\u3002\u904d\u5386\u6570\u7ec4\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u975e\u8d1f\u6570\u5c06\u5176\u5728 exists \u4e2d\u6807\u8bb0\u4e3a true\u3002\u904d\u5386 exists \u6570\u7ec4\uff0c\u8fd4\u56de\u7b2c\u4e00\u4e2a\u503c\u4e3a false \u7684\u7d22\u5f15\u4f5c\u4e3a mex\u3002 Java \u6570\u7ec4\u7684 MEX \u662f\u4ec0\u4e48\uff1f MEX\uff08Minimum Excluded Value\uff09\u662f\u6570\u7ec4\u4e2d\u6ca1\u6709\u51fa\u73b0\u7684\u6700\u5c0f\u975e\u8d1f\u6574\u6570\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u6570\u7ec4 [2, 3, 5, 7]\uff0cMEX \u4e3a 0\uff0c\u56e0\u4e3a 0 \u5230 7 \u7684\u6240\u6709\u6574\u6570\u90fd\u51fa\u73b0\u5728\u6570\u7ec4\u4e2d\u3002 \u5982\u4f55\u8ba1\u7b97 MEX\uff1f Java \u4e2d\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6b65\u9aa4\u8ba1\u7b97 MEX\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b public static int findMex(int[] arr) { boolean[] exists = new boolean[arr.length + 1]; \/\/ \u8bb0\u5f55\u6570\u7ec4\u4e2d\u5b58\u5728\u7684\u5143\u7d20 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-65447","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65447","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=65447"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65447\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65447"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65447"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65447"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}