题目标签:Binary Search 题目给了我们一组字母,让我们找出比 target 大的最小的那个字母. 利用 binary search,如果mid 比 target 小,或者等于,那么移到右半边: 如果 mid 比target 大,那么移到左半边,这里要包括mid,因为mid 可能是那个要找的字母. 这里还要检查一个可能,如果 target 是 z, 那么 最小的那个字母,就是 比z 大的字母. 来覆盖这个可能性,可以用 target 比 array 里最后那个字母, 如果target大…

题目 太简单了,直接上代码: class Solution { public: char nextGreatestLetter(vector<char>& letters, char target) { int n = letters.size(); ] = {}; ;i < n; ++i){ a[letters[i]-'a']++; } )%; ; i++,i%=){ ) return (char)(i + 'a'); } } };…

problem 744. Find Smallest Letter Greater Than Target 题意:一堆有序的字母,然后又给了一个target字母,让求字母数组中第一个大于target的字母,数组是循环的,如果没有,那就返回第一个字母. solution1:注意数组已经是有序数组啦...注意mid的计算,注意最后返回的元素位置. class Solution { public: char nextGreatestLetter(vector<char>& letters,…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 线性扫描 二分查找 日期 题目地址:https://leetcode.com/problems/find-smallest-letter-greater-than-target/description/ 题目描述 Given a list of sorted characters letters containing only lowercase l…

Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target. Letters also wrap around. For example, if the target is target…

思路:二分法,时间复杂度o(logn) class Solution(object): def nextGreatestLetter(self, letters, target): """ :type letters: List[str] :type target: str :rtype: str """ left, right = 0, len(letters) - 1 while left <= right: mid = (left +…

Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target. Letters also wrap around. For example, if the target is target…

［抄题］: Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target. Letters also wrap around. For example, if the target is t…

俩方法都是用二分查找,一个调库,一个自己写而已. 方法一,调库 static int wing=[]() { std::ios::sync_with_stdio(false); cin.tie(NULL); ; }(); class Solution { public: char nextGreatestLetter(vector<char>& letters, char target) { auto p=upper_bound(letters.begin(),letters.end(…

Leetcode之二分法专题-744. 寻找比目标字母大的最小字母(Find Smallest Letter Greater Than Target) 给定一个只包含小写字母的有序数组letters 和一个目标字母 target,寻找有序数组里面比目标字母大的最小字母. 数组里字母的顺序是循环的.举个例子,如果目标字母target = 'z' 并且有序数组为 letters = ['a', 'b'],则答案返回 'a'. 示例: 输入: letters = ["c", "f&…

Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target. Letters also wrap around. For example, if the target is target…

这是悦乐书的第306次更新,第326篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第175题(顺位题号是744).给定一个仅包含小写字母的有序字符数组,并给定目标字母目标,找到数组中大于给定目标字符的最小元素.例如,如果目标是target ='z'并且letters = ['a','b'],则答案是'a'.例如: 输入:letters = ["c","f","j"],target ="a" 输出:…

问题 该文章的最新版本已迁移至个人博客[比特飞],单击链接 https://www.byteflying.com/archives/4001 访问. 给定一个只包含小写字母的有序数组letters 和一个目标字母 target,寻找有序数组里面比目标字母大的最小字母. 数组里字母的顺序是循环的.举个例子,如果目标字母target = 'z' 并且有序数组为 letters = ['a', 'b'],则答案返回 'a'. 输入: letters = ["c", "f"…

Given a list of sorted characters letterscontaining only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target. Letters also wrap around. For example, if the target is target =…

Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target. Letters also wrap around. For example, if the target is target…

题目描述: Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target. Letters also wrap around. For example, if the target is t…

给定一个只包含小写字母的有序数组letters 和一个目标字母 target,寻找有序数组里面比目标字母大的最小字母. 数组里字母的顺序是循环的.举个例子,如果目标字母target = 'z' 并且有序数组为 letters = ['a', 'b'],则答案返回 'a'. 示例: 输入: letters = ["c", "f", "j"] target = "a" 输出: "c" 输入: letters =…

C#版 - Leetcode 744. 寻找比目标字母大的最小字母 - 题解 744.Find Smallest Letter Greater Than Target 在线提交: https://leetcode-cn.com/problems/find-smallest-letter-greater-than-target/ 题目描述 给定一个只包含小写字母的有序数组letters 和一个目标字母 target,寻找有序数组里面比目标字母大的最小字母. 数组里字母的顺序是循环的.举个例子,如果…

Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example: matrix = [ [ 1, 5…

原题链接在这里:https://leetcode.com/problems/lexicographically-smallest-equivalent-string/ 题目: Given strings A and B of the same length, we say A[i] and B[i] are equivalent characters. For example, if A = "abc" and B = "cde", then we have 'a'…

Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Follow up: What if the BST is modified (insert/delete operations) often and you nee…

We all know how to search through an array for an element whose value equals the target value, but how to search for the element that has value greater than the target value? A particularly elegant way of thinking about this problem is to think about…

Given a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus sum of all keys greater than the original key in BST. Example: Input: The root of a Binary Search Tree like thi…

Given an integer array, return the k-th smallest distance among all the pairs. The distance of a pair (A, B) is defined as the absolute difference between A and B. Example 1: Input: nums = [1,3,1] k = 1 Output: 0 Explanation: Here are all the pairs:…

题目链接:https://leetcode.com/problems/all-paths-from-source-to-target/description/ Given a directed, acyclic graph of N nodes.  Find all possible paths from node 0 to node N-1, and return them in any order. The graph is given as follows:  the nodes are…

题目链接: https://leetcode.com/problems/combination-sum/?tab=Description   Problem: 给定数组并且给定一个target,求出所有满足求和等于target的数字组合   遍历所有的数组中元素,然后对target进行更新,将该元素添加到tempList中,直到remain等于0时达到条件,可以将该tempList添加到list中   注意:每个元素可以使用多次,因此每次的遍历都要从上次的那个下标开始.   当target更新到…

题目链接 https://leetcode.com/problems/3sum-closest/?tab=Description     Problem : 找到给定数组中a+b+c 最接近target的组合   类似求三个数之和为0的思路:每次更新求和的result值,利用函数Math.abs()判断绝对值最小的为result   参考代码: package leetcode_50; import java.util.Arrays; /*** * * @author pengfei_zheng…

Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Example 1: Input: root = [3,1,4,null,2], k = 1 3 / \ 1 4 \   2 Output: 1 Example 2:…

题目大意 https://leetcode.com/problems/kth-smallest-element-in-a-bst/description/ 230. Kth Smallest Element in a BST Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid,…

Given an array A, we may rotate it by a non-negative integer K so that the array becomes A[K], A[K+1], A{K+2], ... A[A.length - 1], A[0], A[1], ..., A[K-1].  Afterward, any entries that are less than or equal to their index are worth 1 point. For exa…