{"id":37691,"date":"2024-11-26T08:10:47","date_gmt":"2024-11-26T00:10:47","guid":{"rendered":"https:\/\/fwq.ai\/blog\/37691\/"},"modified":"2024-11-26T08:10:47","modified_gmt":"2024-11-26T00:10:47","slug":"java%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/37691\/","title":{"rendered":"java\u6570\u7ec4\u600e\u4e48\u5224\u65ad\u662f\u5426\u5b58\u5728"},"content":{"rendered":"<blockquote><p>\n  \u8981\u5224\u65ad java \u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a1. \u987a\u5e8f\u641c\u7d22\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\uff1b2. \u4e8c\u5206\u641c\u7d22\uff08\u9002\u7528\u4e8e\u6392\u5e8f\u6570\u7ec4\uff09\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(log n)\uff1b3. \u4f7f\u7528 hashset\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\u3002\u9009\u62e9\u65b9\u6cd5\u53d6\u51b3\u4e8e\u6570\u7ec4\u5927\u5c0f\u3001\u6392\u5e8f\u72b6\u6001\u548c\u64cd\u4f5c\u9891\u7387\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111309064275913.jpg\" class=\"aligncenter\" title=\"java\u6570\u7ec4\u600e\u4e48\u5224\u65ad\u662f\u5426\u5b58\u5728\u63d2\u56fe\" alt=\"java\u6570\u7ec4\u600e\u4e48\u5224\u65ad\u662f\u5426\u5b58\u5728\u63d2\u56fe\" \/><\/p>\n<p><strong>Java \u6570\u7ec4\u5224\u65ad\u5143\u7d20\u662f\u5426\u5b58\u5728<\/strong><\/p>\n<p><strong>\u5982\u4f55\u5224\u65ad Java \u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u5143\u7d20\uff1f<\/strong><\/p>\n<p>\u8981\u5224\u65ad Java \u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<p><strong>1. \u987a\u5e8f\u641c\u7d22<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<ul>\n<li>\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5c06\u5176\u4e0e\u8981\u67e5\u627e\u7684\u5143\u7d20\u8fdb\u884c\u6bd4\u8f83\u3002<\/li>\n<li>\u5982\u679c\u627e\u5230\u5339\u914d\u9879\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<p><strong>\u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>public static boolean exists(int[] arr, int element) {\n    for (int i = 0; i &lt; arr.length; i++) {\n        if (arr[i] == element) {\n            return true;\n        }\n    }\n    return false;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/strong>O(n)\uff0c\u5176\u4e2d n \u662f\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<p><strong>2. \u4e8c\u5206\u641c\u7d22\uff08\u4ec5\u9002\u7528\u4e8e\u6392\u5e8f\u6570\u7ec4\uff09<\/strong><\/p>\n<ul>\n<li>\u5bf9\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\u3002<\/li>\n<li>\u4f7f\u7528\u4e8c\u5206\u641c\u7d22\u7b97\u6cd5\u5728\u6392\u5e8f\u540e\u7684\u6570\u7ec4\u4e2d\u67e5\u627e\u5143\u7d20\u3002<\/li>\n<li>\u5982\u679c\u627e\u5230\u5339\u914d\u9879\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<p><strong>\u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>public static boolean exists(int[] arr, int element) {\n    Arrays.sort(arr);\n    int start = 0;\n    int end = arr.length - 1;\n    while (start &lt;= end) {\n        int mid = (start + end) \/ 2;\n        if (arr[mid] == element) {\n            return true;\n        } else if (arr[mid] &lt; element) {\n            start = mid + 1;\n        } else {\n            end = mid - 1;\n        }\n    }\n    return false;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/strong>O(log n)\uff0c\u5176\u4e2d n \u662f\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<p><strong>3. \u4f7f\u7528 HashSet<\/strong><\/p>\n<ul>\n<li>\u5c06\u6570\u7ec4\u5143\u7d20\u5b58\u50a8\u5728 HashSet \u4e2d\u3002<\/li>\n<li>\u68c0\u67e5 HashSet \u4e2d\u662f\u5426\u5305\u542b\u8981\u67e5\u627e\u7684\u5143\u7d20\u3002<\/li>\n<li>\u5982\u679c\u5305\u542b\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<p><strong>\u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>public static boolean exists(int[] arr, int element) {\n    Set&lt;Integer&gt; set = new HashSet&lt;&gt;();\n    for (int i = 0; i &lt; arr.length; i++) {\n        set.add(arr[i]);\n    }\n    return set.contains(element);\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/strong>O(n)\uff0c\u5176\u4e2d n \u662f\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<p><strong>\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\uff1f<\/strong><\/p>\n<ul>\n<li>\u5bf9\u4e8e\u5c0f\u578b\u6570\u7ec4\u6216\u672a\u6392\u5e8f\u6570\u7ec4\uff0c<strong>\u987a\u5e8f\u641c\u7d22<\/strong>\u901a\u5e38\u662f\u6700\u4f73\u9009\u62e9\u3002<\/li>\n<li>\u5bf9\u4e8e\u5927\u578b\u6392\u5e8f\u6570\u7ec4\uff0c<strong>\u4e8c\u5206\u641c\u7d22<\/strong>\u662f\u6700\u6709\u6548\u7684\u9009\u62e9\u3002<\/li>\n<li> <strong>HashSet<\/strong> \u65b9\u6cd5\u5728\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u9891\u7e41\u7684\u60c5\u51b5\u4e0b\u975e\u5e38\u6709\u7528\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u6570\u7ec4\u600e\u4e48\u5224\u65ad\u662f\u5426\u5b58\u5728\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8981\u5224\u65ad java \u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a1. \u987a\u5e8f\u641c\u7d22\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\uff1b2. \u4e8c\u5206\u641c\u7d22\uff08\u9002\u7528\u4e8e\u6392\u5e8f\u6570\u7ec4\uff09\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(log n)\uff1b3. \u4f7f\u7528 hashset\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\u3002\u9009\u62e9\u65b9\u6cd5\u53d6\u51b3\u4e8e\u6570\u7ec4\u5927\u5c0f\u3001\u6392\u5e8f\u72b6\u6001\u548c\u64cd\u4f5c\u9891\u7387\u3002 Java \u6570\u7ec4\u5224\u65ad\u5143\u7d20\u662f\u5426\u5b58\u5728 \u5982\u4f55\u5224\u65ad Java \u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u5143\u7d20\uff1f \u8981\u5224\u65ad Java \u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a 1. \u987a\u5e8f\u641c\u7d22 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5c06\u5176\u4e0e\u8981\u67e5\u627e\u7684\u5143\u7d20\u8fdb\u884c\u6bd4\u8f83\u3002 \u5982\u679c\u627e\u5230\u5339\u914d\u9879\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002 \u4ee3\u7801\u793a\u4f8b\uff1a public static boolean exists(int[] arr, int element) { for (int i = 0; i &lt; arr.length; i++) { if (arr[i] == element) { return true; } } return [&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-37691","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37691","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=37691"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37691\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=37691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=37691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=37691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}