Have you thought about this?Here are some good questions to ask before coding. Bonus points for you if you have already thought through this!If the integer's last digit is 0, what should the output be? ie, cases such as 10, 100.Did you notice that the reversed integer might overflow?
Two questions use the same idea, recursion and backtracking, when target hit 0, record the result. The combination sum allows unlimited duplicates while the other limits the duplicates numbers. Notice we always need to avoid duplicates by counting the number of same elements in the recursion for...
Then-queens puzzle is the problem of placingnqueens on ann×nchessboard such that no two queens attack each other. Given an integern, return all distinct solutions to then-queens puzzle. Each solution contains a distinct board configuration of then-queens' placement, where'Q'and'.'both indicat...
{ var output = i + ' '; switch (i) { case 0: output += 'Zero'; break; case 1: output += 'One'; break; case 2: output += 'Two'; break; default: output += 'And so on...'; break; } console.log(output);} 如果可能更好地澄清您的情况下确切的需要,因为这个例子显然只适用...
public ListInteger findSubstring(String s, String[] words) { if (words.length == 0 || words[0].length() == 0) return new ArrayList(); HashMapString, Integer map = new HashMap(); for (String word : words) map.put(word, map.getOrDefault(word, 0) + 1); ListInteger list = ...
这篇文章是关于LeetCode Top 100 Liked Questions 的 专栏记录,其中部分题目可能包括解题思路和多种优化解法。我把自己的思路都记录在这里,如果你看见了,请记得点个赞吧,蟹蟹【手动笑脸】。 1、Two Sum Given an array of integers, return indices of the two numbers such that they add up to a specific ...
Leetcode 上有个List选项,里边有两个专题,分别是Top 100Liked Questions和Top Interview Questions。这两个List中有很多重复的题,加起来一共150道左右。都是经典的题目,将这150道刷完基本上所有的题型都见过了,而且多数经典题目都会涉及,是提升最快的一个方法。1314注意记录、总结与复习。自己写过的代码一定要保存...
class Solution { public String convert(String s, int numRows) { if (numRows==1) return s; //if there is only one row return string List<StringBuilder> rows=new ArrayList<>(); for (int i=0; i<Math.min(numRows, s.length()); i++){ rows.add(new StringBuilder()); } int cur...
下次再整理更多questions,或者你有想问的问题并且懒得加我微信,在下面留言我会整理到这篇回答。Thanks! How to become a more responsible person? Postedby:lexigreyon:March 14, 2014 In:Uncategorized 9Comments 最近搬家,发现自己各种utility late fee,然后没想起来提前30天通知land lord,罚了$2000的lease termin...
class TwoSum { private List<Integer> nums = new ArrayList<>(); /** Initialize your data structure here. */ public TwoSum() { } /** Add the number to an internal data structure.. */ public void add(int number) { if (nums.isEmpty()) { nums.add(number); return; } int l=0,...