CNoodle

摘要： Design the CombinationIterator class: CombinationIterator(string characters, int combinationLength) Initializes the object with a string characters of 阅读全文

摘要： In LeetCode Store, there are n items to sell. Each item has a price. However, there are some special offers, and a special offer consists of one or mo 阅读全文

摘要： You are given the array paths, where paths[i] = [cityAi, cityBi] means there exists a direct path going from cityAi to cityBi. Return the destination 阅读全文

摘要： Given an integer num, return a string representing its hexadecimal representation. For negative integers, two’s complement method is used. All the let 阅读全文

摘要： Given a 0-indexed integer array nums, return true if it can be made strictly increasing after removing exactly one element, or false otherwise. If the 阅读全文

摘要： Given the array prices where prices[i] is the price of the ith item in a shop. There is a special discount for items in the shop, if you buy the ith i 阅读全文

摘要： There is only one character 'A' on the screen of a notepad. You can perform two operations on this notepad for each step: Copy All: You can copy all t 阅读全文

摘要： Given the root of a binary search tree, return a balanced binary search tree with the same node values. If there is more than one answer, return any o 阅读全文

摘要： Given a string s, reverse the string according to the following rules: All the characters that are not English letters remain in the same position. Al 阅读全文

摘要： Given a string text, you want to use the characters of text to form as many instances of the word "balloon" as possible. You can use each character in 阅读全文

摘要： You are given n points in the plane that are all distinct, where points[i] = [xi, yi]. A boomerang is a tuple of points (i, j, k) such that the distan 阅读全文

摘要： There are n students in a class numbered from 0 to n - 1. The teacher will give each student a problem starting with the student number 0, then the st 阅读全文

摘要： Given an array points where points[i] = [xi, yi] represents a point on the X-Y plane, return true if these points are a boomerang. A boomerang is a se 阅读全文

摘要： Given the root of a binary tree, return the number of nodes where the value of the node is equal to the sum of the values of its descendants. A descen 阅读全文

摘要： A newly designed keypad was tested, where a tester pressed a sequence of n keys, one at a time. You are given a string keysPressed of length n, where  阅读全文

摘要： You are given a string s, and an array of pairs of indices in the string pairs where pairs[i] = [a, b] indicates 2 indices(0-indexed) of the string. Y 阅读全文

摘要： Given the API rand7() that generates a uniform random integer in the range [1, 7], write a function rand10() that generates a uniform random integer i 阅读全文

摘要： You are given a 0-indexed integer array nums, where nums[i] represents the score of the ith student. You are also given an integer k. Pick the scores 阅读全文

摘要： Given an array of positive integers arr, calculate the sum of all possible odd-length subarrays. A subarray is a contiguous subsequence of the array. 阅读全文

摘要： Given the root of a Binary Search Tree and a target number k, return true if there exist two elements in the BST such that their sum is equal to the g 阅读全文