James Pan

原题网址：https://leetcode.com/problems/graph-valid-tree/ Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to check whether these

原题网址：https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/ Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), wr

原题网址：https://leetcode.com/problems/minimum-height-trees/ For a undirected graph with tree characteristics, we can choose any node as the root. The result graph is then a rooted tree. Among all po

原题网址：https://leetcode.com/problems/shortest-distance-from-all-buildings/ You want to build a house on an empty land which reaches all buildings in the shortest amount of distance. You can only