https://leetcode.com/problems/reverse-integer/ understanding: 最intuitive的办法就是直接把integer化成string,然后变成list。这里如果化成string,会有溢出的问题,比如integer是1534236469,这个数字反过来就是个很大的数,溢出了,必须返回0. 如果是直接用int计算的,那就会自动溢出得到正确结果。这里如果变成list,则效率底下。
力扣leetcode-cn.com/problems/reverse-vowels-of-a-string/ 题目描述 给你一个字符串 s ,仅反转字符串中的所有元音字母,并返回结果字符串。 元音字母包括 'a'、'e'、'i'、'o'、'u',且可能以大小写两种形式出现。 示例1: 输入:s = "hello" 输出:"holle" 示例2: 输入:s = "leetcode" 输出:...
Leetcode 344:Reverse String 反转字符串 公众号:爱写bug Write a function that reverses a string. The input string is given as an array of characterschar[]. Do not allocate extra space for another array, you must do this bymodifying the input array in-placewith O(1) extra memory. You may...
Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there are less than k characters left, reverse all of them. If there are less than 2k but greater than or equal to k characters, then reverse...
classSolution{public:stringreverseVowels(string s){vector<char>vowels={'a','e','i','o','u','A','E','I','O','U'};intlen=s.length();booli_found=false;boolj_found=false;for(inti=0,j=1;i+j<len;){if(find(vowels.begin(),vowels.end(),s[i])==vowels.end()){i++;continu...
Leetcode: Reverse Words in a String 题目: Given an input string, reverse the string word by word. For example, Given s = “the sky is blue”, return “blue is sky the”. 思路一: 先休整下给定的字符串,去掉其中的多于一个的空格,就是使所有单词之间的空格都变成一个,然后去掉最后面的空格,...
publicStringreverseVowels(Strings){if(s==null||s.trim().length()<=1){returns;}Stack<Character>stack=newStack<Character>();char[]arr=s.toCharArray();for(int i=0;i<arr.length;i++){char ch=arr[i];if(ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u'||ch=='A'||ch=='...
2. Analysis: The input string is in a array of character s, so we can eaily use the reverse() funtion of Python which can exactly reverse the list. Another way we can use two pointers,one points the head another points the tail. ...
LeetCode笔记:345. Reverse Vowels of a String 问题: Write a function that takes a string as input and reverse only the vowels of a string. Example 1: Given s = "hello", return "holle". Example 2: Given s = "leetcode", return "leotcede". Note: The vowels does not include the ...
151. Reverse Words in a String Given an input string, reverse the string word by word. For example, Given s = "the sky is blue", return "blue is sky the". 题目大意: 输入一个字符串,将单词序列反转。 思路1: 采用一个vector,来存放中间结果 ...