<br />
<b>Notice</b>:  Trying to get property 'ID' of non-object in <b>/var/www/html/feellikelearning/wp-content/themes/songwriter-premium/functions.php</b> on line <b>371</b><br />
{"version":"1.0","provider_name":"Feel Like Learning","provider_url":"https:\/\/feellikelearning.com","author_name":"feellikelearning","author_url":"https:\/\/feellikelearning.com\/index.php\/author\/feellikelearning\/","title":"\u7b97\u6cd5\u7ec3\u4e60 Leetcode \u529b\u6263 207. Course Schedule \u89e3\u6cd5 | Feel Like Learning","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"PoGpJvKcEZ\"><a href=\"https:\/\/feellikelearning.com\/index.php\/2020\/06\/20\/leetcode-207-course-schedule-solution\/\">\u7b97\u6cd5\u7ec3\u4e60 Leetcode \u529b\u6263 207. Course Schedule \u89e3\u6cd5<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/feellikelearning.com\/index.php\/2020\/06\/20\/leetcode-207-course-schedule-solution\/embed\/#?secret=PoGpJvKcEZ\" width=\"600\" height=\"338\" title=\"&#8220;\u7b97\u6cd5\u7ec3\u4e60 Leetcode \u529b\u6263 207. Course Schedule \u89e3\u6cd5&#8221; &#8212; Feel Like Learning\" data-secret=\"PoGpJvKcEZ\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script type=\"text\/javascript\">\n\/*! This file is auto-generated *\/\n!function(c,d){\"use strict\";var e=!1,o=!1;if(d.querySelector)if(c.addEventListener)e=!0;if(c.wp=c.wp||{},c.wp.receiveEmbedMessage);else if(c.wp.receiveEmbedMessage=function(e){var t=e.data;if(!t);else if(!(t.secret||t.message||t.value));else if(\/[^a-zA-Z0-9]\/.test(t.secret));else{for(var r,s,a,i=d.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),n=d.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),o=new RegExp(\"^https?:$\",\"i\"),l=0;l<n.length;l++)n[l].style.display=\"none\";for(l=0;l<i.length;l++)if(r=i[l],e.source!==r.contentWindow);else{if(r.removeAttribute(\"style\"),\"height\"===t.message){if(1e3<(s=parseInt(t.value,10)))s=1e3;else if(~~s<200)s=200;r.height=s}if(\"link\"===t.message)if(s=d.createElement(\"a\"),a=d.createElement(\"a\"),s.href=r.getAttribute(\"src\"),a.href=t.value,!o.test(a.protocol));else if(a.host===s.host)if(d.activeElement===r)c.top.location.href=t.value}}},e)c.addEventListener(\"message\",c.wp.receiveEmbedMessage,!1),d.addEventListener(\"DOMContentLoaded\",t,!1),c.addEventListener(\"load\",t,!1);function t(){if(o);else{o=!0;for(var e,t,r,s=-1!==navigator.appVersion.indexOf(\"MSIE 10\"),a=!!navigator.userAgent.match(\/Trident.*rv:11\\.\/),i=d.querySelectorAll(\"iframe.wp-embedded-content\"),n=0;n<i.length;n++){if(!(r=(t=i[n]).getAttribute(\"data-secret\")))r=Math.random().toString(36).substr(2,10),t.src+=\"#?secret=\"+r,t.setAttribute(\"data-secret\",r);if(s||a)(e=t.cloneNode(!0)).removeAttribute(\"security\"),t.parentNode.replaceChild(e,t);t.contentWindow.postMessage({message:\"ready\",secret:r},\"*\")}}}}(window,document);\n<\/script>\n","description":"\u8fd9\u9898\u4ee5\u524d\u89c9\u5f97\u7279\u522b\u96be\uff0c\u5176\u5b9e\u662f\u7b80\u5316\u7248\u7684topological sort\uff0c\u4e5f\u5c31\u662f\u53ea\u9700\u8981\u5224\u65ad\u6709\u6ca1\u6709\u73af(circular dependency)\u548c\u7701\u6389\u4e86sort\u90e8\u5206\u3002\u53ef\u4ee5\u7528269 alien dictionary\u540c\u6837\u7684DFS\u601d\u8def\u52a0\u4ee5\u7b80\u5316\u800c\u6210\u3002 \u8fd9\u662f\u6700\u8fd1\u5199\u5f97\u6bd4\u8f83\u6ee1\u610f\u7684python\u89e3\u6cd5\u3002 \u5bf9\u6bd4\u4e00\u4e0b\u5927\u6982\u534a\u5e74\u524d\u5199\u5f97\u5f53\u65f6\u6bd4\u8f83\u6ee1\u610f\u7248\u672c\uff0c\u5176\u5b9e\u7b97\u6cd5\u5dee\u4e0d\u591a\u3002\u6709\u5982\u4e0b\u5c0f\u6539\u8fdb\u8ba9code\u66f4\u77ed\u4e86\uff1a1. seen\u7528\u4e86Tree\u548cFalse\u8868\u793a\u8d70\u901a\u4e86\u7684\u548c\u5f53\u524d\u6b63\u5728\u8d70\u7684\u8def\u5f84\uff0c\u6bd4\u539f\u6765\u7684\u66f4\u7701\u4e8b\u3002\u770b\u67652\u79cd\u72b6\u6001\u662f\u5224\u65ad\u73af\u548c\u907f\u514d\u91cd\u65b0\u8d70\u539f\u6765\u8d70\u8fc7\u7684\u8def\u6240\u5fc5\u8981\u7684\u30022. \u8282\u70b9\u5168\u90e8\u5199\u8fdbedges\u91cc\u9762\uff0cedges = {c: set() for c in range(numCourses)} \uff0c\u4e0d\u7ba1\u6709\u6ca1\u6709dependency\uff0c\u7701\u4e86 if i not in deps: \u5224\u65ad3. \u9700\u8981order\u7684\u8bdd\uff0cdfs\u53c2\u6570start, edges, seen order\u3002\u4e0d\u9700\u8981\u7684\u8bddorder\u7684\u8bdd\u5c31\u7701\u6389order\uff0c\u53ea\u8981start, edges, seen\u3002\u7528\u51fd\u6570\u5185\u5b9a\u4e49\u51fd\u6570\u53ef\u4ee5\u5c11\u5199\u5f88\u591a\u7528\u6765\u4f20\u9012\u72b6\u6001\u7684\u53c2\u6570\u3002"}