LeetCode

題目

There is a directed graph of n colored nodes and m edges. The nodes are numbered from 0 to n - 1.

題目

Given an integer array nums, return the number of subarrays filled with 0.

題目

You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in adjacent plots.

… Read More »LeetCode: 1470-Shuffle the Array 解題紀錄

題目

For two strings s and t, we say "t divides s" if and only if s = t + ... + t (i.e., t is concatenated with itself one or more times).

題目

Given an undirected tree consisting of n vertices numbered from 0 to n-1, which has some apples in their vertices. You spend 1 second to walk over one edge of the tree. Return the minimum time in seconds you have to spend to collect all apples in the tree, starting at vertex 0 and coming back to this vertex.

題目

Given the roots of two binary trees p and q, write a function to check if they are the same or not.

Two binary trees are considered the same if they are structurally identical, and the nodes have the same value.

… Read More »LeetCode: 144-Binary Tree Preorder Traversal 解題紀錄

題目

You are given a 0-indexed integer array tasks, where tasks[i] represents the difficulty level of a task. In each round, you can complete either 2 or 3 tasks of the same difficulty level.