{"id":26988,"date":"2023-04-27T17:58:43","date_gmt":"2023-04-27T09:58:43","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=26988"},"modified":"2023-07-30T23:35:31","modified_gmt":"2023-07-30T15:35:31","slug":"c%e7%9a%84%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e4%b8%ad%ef%bc%8c%e6%9f%90%e4%b8%aa%e7%bb%93%e7%82%b9root%e7%9a%84%e8%a1%a8%e7%a4%ba%e4%b8%adroot%e5%92%8crootnullptr%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/26988.html","title":{"rendered":"c++\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u67d0\u4e2a\u7ed3\u70b9root\u7684\u8868\u793a\u4e2d!root\u548croot!=nullptr\u7684\u533a\u522b\u5728\u54ea"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>c++\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u67d0\u4e2a\u7ed3\u70b9root\u7684\u8868\u793a\u4e2d!root\u548croot!=nullptr\u7684\u533a\u522b\u662f\uff1a!root \u8868\u793a root \u6307\u9488\u4e3a\u7a7a\u6307\u9488 nullptr\uff0c\u4e5f\u5c31\u662f root \u6307\u5411\u7684\u8282\u70b9\u4e0d\u5b58\u5728\u3002root != nullptr \u8868\u793a root \u6307\u9488\u4e0d\u4e3a\u7a7a\u6307\u9488 nullptr\uff0c\u4e5f\u5c31\u662f root \u6307\u5411\u7684\u8282\u70b9\u5b58\u5728\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" alt=\"\" class=\"wp-image-26990\" decoding=\"async\" height=\"421\" sizes=\"(max-width: 680px) 100vw, 680px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/04\/\u95ee\u7b54\u6a21\u677f680-\u00d7-421-\u50cf\u7d20-31-2.jpg?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/04\/\u95ee\u7b54\u6a21\u677f680-\u00d7-421-\u50cf\u7d20-31-2.jpg?x-oss-process=image\/auto-orient,1\/format,webp 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/04\/\u95ee\u7b54\u6a21\u677f680-\u00d7-421-\u50cf\u7d20-31-2-300x186.jpg 300w\" width=\"680\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\">\u4e00\u3001c++\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u67d0\u4e2a\u7ed3\u70b9root\u7684\u8868\u793a\u4e2d!root\u548croot!=nullptr\u7684\u533a\u522b<\/h2>\n<p>\u5728 C++ \u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u901a\u5e38\u4f7f\u7528\u6307\u9488\u6765\u8868\u793a\u8282\u70b9\u4e4b\u95f4\u7684\u8fde\u63a5\u5173\u7cfb\u3002\u5f53\u8868\u793a\u67d0\u4e2a\u8282\u70b9\u65f6\uff0c\u6709\u65f6\u4f1a\u4f7f\u7528 !root \u548c root != nullptr \u4e24\u79cd\u65b9\u5f0f\u3002\u5b83\u4eec\u7684\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n<p>!root \u8868\u793a root \u6307\u9488\u4e3a\u7a7a\u6307\u9488 nullptr\uff0c\u4e5f\u5c31\u662f root \u6307\u5411\u7684\u8282\u70b9\u4e0d\u5b58\u5728\u3002\u5f53\u4f7f\u7528 !root \u8868\u793a\u8282\u70b9\u65f6\uff0c\u901a\u5e38\u6307\u8be5\u8282\u70b9\u4e0d\u5b58\u5728\uff0c\u6216\u8005\u8be5\u8282\u70b9\u7684\u67d0\u4e9b\u5c5e\u6027\u4e3a\u7a7a\u3002<\/p>\n<p>root != nullptr \u8868\u793a root \u6307\u9488\u4e0d\u4e3a\u7a7a\u6307\u9488 nullptr\uff0c\u4e5f\u5c31\u662f root \u6307\u5411\u7684\u8282\u70b9\u5b58\u5728\u3002\u5f53\u4f7f\u7528 root != nullptr \u8868\u793a\u8282\u70b9\u65f6\uff0c\u901a\u5e38\u6307\u8be5\u8282\u70b9\u5b58\u5728\uff0c\u6216\u8005\u8be5\u8282\u70b9\u7684\u67d0\u4e9b\u5c5e\u6027\u4e0d\u4e3a\u7a7a\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u7f16\u7801\u4e2d\uff0c\u901a\u5e38\u4f1a\u6839\u636e\u9700\u8981\u9009\u62e9\u4f7f\u7528 !root \u6216\u8005 root != nullptr\u3002\u4f8b\u5982\uff0c\u5728\u904d\u5386\u4e8c\u53c9\u6811\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 while (node != nullptr) \u6216\u8005 while (!stack.empty()) \u6765\u5224\u65ad\u8282\u70b9\u662f\u5426\u5b58\u5728\uff0c\u8fd9\u4e24\u79cd\u65b9\u5f0f\u662f\u7b49\u4ef7\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"c++\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u67d0\u4e2a\u7ed3\u70b9root\u7684\u8868\u793a\u4e2d!root\u548croot!=nullptr\u7684\u533a\u522b\u662f\uff1a!root \u8868\u793a [&hellip;]","protected":false},"author":1,"featured_media":26991,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[377],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/26988"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=26988"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/26988\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/26991"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=26988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=26988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=26988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}