pinprerequisites:graph[p].append(c)indegree[c]+=1# 筛选出不需要预先课程的课queue=[iforiinrange(n)ifindegree[i]==0]path=[]# 上课顺序whilequeue:# queue 里的课程都是已满足或无预先课程的,挑出第一门i来读i=queue.pop(0)path.append(i)# 当我们完成课程i后
摘要:https://leetcode.com/problems/minimum-height-trees/discuss/76055/Share-some-thoughts For a undirected graph with tree characteristics, we can choose any node as the root. The result graph is then a...阅读全文 阅读全文
【207】Course Schedule 【210】Course Schedule II 【269】Alien Dictionary 【329】Longest Increasing Path in a Matrix 【444】Sequence Reconstruction
[310. 最小高度树](https://leetcode.cn/problems/minimum-height-trees/) 329. 矩阵中的最长递增路径 802. 找到最终的安全状态 [851. 喧闹和富有](https://leetcode.cn/problems/loud-and-rich/) 913. 猫和老鼠 1203. 项目管理 [1462. 课程表 IV](https://leetcode.cn/problems/course-schedule-iv/...
Leetcode Sorting ❓s: 912. Sort an Array 922. Sort Array By Parity II 973. K Closest Points to Origin 977. Squares of a Sorted Array 1470. Shuffle the Array 1480. Running Sum of 1d Array 1512. Number of Good Pairs 1672. Richest Customer Wealth 1678. Goal Parser Interpretation 1720...
2019-12-04 08:47 − 原题链接在这里:https://leetcode.com/problems/custom-sort-string/ 题目: S and T are strings composed of lowercase letters. In S, no letter oc... Dylan_Java_NYC 0 429 [Algorithm] 905. Sort Array By Parity 2019-12-22 03:46 − Given an array A of non...
210. Course Schedule IIleetcode.com/problems/course-schedule-ii/ class Solution { private List<List<Integer>> graph = new ArrayList<>(); private void addEdge(int x, int y) { // x -> y graph.get(x).add(y); } public int[] findOrder(int numCourses, int[][] prerequisites) {...
中等 329. 矩阵中的最长递增路径 53.0% 困难 444. 序列重建 32.2% 中等 631. 设计 Excel 求和公式 33.9% 困难 802. 找到最终的安全状态 59.7% 中等 851. 喧闹和富有 64.2% 中等 913. 猫和老鼠 49.5% 困难 1059. 从始点到终点的所有路径 35.1% 中等 1136. 并行课程 61.1% 中等 1203. 项目管理 60.3%...
Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair:[0,1] Given the total number of courses and a list of prerequisite pairs, is it possible for you to finish all courses?
pre-requisite problems: a course cannot be selected unless its pre-requisite courses are taken dependency problems task schedule 时间复杂度: O(V+E) Topological Sort(){1. Call DFS to compute finish time f[v]foreach vertex2. At each vertex is finished, insert it onto the front of a linked...