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Safe and smooth inkDual Brush Pen with high quality ink, flowing smoothly and drying fast, no smear, leak, bleed, or fade, feel comfort, both adults and children can use for a long time. |
Dual tips design0.4mm fine tip can make precise and consistent lines, for outlining and further detail; 1-2mm brush tip can easily make medium or bold strokes, for coloring and calligraphy. |
72 Unique ColorsFine tip colouring pens with bright, vivid, eye-catching and vibrant colors, superior, long-lasting. Each color issubtly divided to give you the most suitable color choice, let you create freely, arouse your artistic creativity. |
- Dual tip brush pens make it is easily switch the lines as you need, very suitable for comics, drawing, writing, sketching, shading, rendering, manga, adult coloring books etc. A great gift for children, friends and family members.
- The pen cap and ink using the same color, allows you to recognize and identify each colour easily and quickly choose the correct color. Distinctive, brilliant and colorful colors, great for helping kids, teens and even adults express their creativity.
- These brush fineliner pens come in a nice plastic storage case which can be easily placed in backpacks. Perfect for use at the park, school, museum, on vacation, or whenever and wherever inspiration strikes.
1.Please make sure the caps stay on tight after using, so the brush pens won’t dry.
2.Children under 3 years old should be used under the supervision of adults
Ace your Coding Interview
Given the root of a binary tree, determine if the binary tree holds children-sum property. For a tree to satisfy the children-sum property, each node’s value should be equal to the sum of values at its left and right subtree.
Given an integer array, shrink it by removing adjacent triplets that satisfy the given constraints and return the total number of elements in the resultant array.
Given a BST, count the total number of nodes that lie within a given range.
An Eulerian trail (or Eulerian path) is a path in a graph that visits every edge exactly once. Given a directed graph, check whether it has an Eulerian path or not.
Given a list of non-negative integers, find the minimum number of merge operations to make it a palindrome. A merge operation can only be performed on two adjacent elements and replace them with their sum.
Given a linked list, construct a complete binary tree from it. Assume that the order of elements present in the linked list is the same as that in the complete tree’s array representation.
Given a list of database transactions, find all read-write conflicts among them. Assume that there is no strict two-phase locking (Strict 2PL) protocol to prevent read-write conflicts.
Given a binary tree, check if removing an edge can split it into two binary trees of equal size.
Given two height-balanced binary search trees, in-place merge them into a single balanced binary search tree. For each node of a height-balanced tree, the difference between its left and right subtree height is at most 1.
Given an array representing the parent-child relationship in a binary tree, find the tree’s height without building it. The parent-child relationship is defined by (A[i], i) for every index i in array A.
Given a binary tree and two tree pointers, x and y, write an efficient algorithm to check if they lie on the same root-to-leaf path in the binary tree. In other words, determine whether x is an ancestor of y, or x is a descendant of y.
Given an array representing the preorder traversal of a BST, determine whether it represents a skewed BST or not. In a skewed BST, each node’s descendants are either smaller or larger than the node itself.
