LeetCode Top Interview Questions 8. String to Integer (atoi) (Java版; Medium) 题目描述 Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary unti
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LeetCode Top Interview Questions 344. Reverse String (Java版; Easy) 题目描述 Write a function that reverses a string. The input string is given as an array of characters char[]. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O...
(Python/Java/C++/C/Go/JS/Rust) 答疑问:是什么原因导致了这两种算法的快慢?答:我用「获取了多少信息」来解释。暴力做法每次拿两个数出来相加,和 target 比较,那么花费 O(1) 的时间,只获取了 O(1) 的信息。而哈希表做法,每次查询都能知道 O(n) 个数中是否有 target−nums[j],那么花费 O(1) 的...
自己做完之后看了别人答案,更优解的话,可以利用 int [26] 来计数字母,这种情况就不用把string sort 排序了。 Java Solution: Runtime: 8 ms, faster than 36.27 % Memory Usage: 39.4 MB, less than 85.70% 完成日期:9/7/2020 关键点:sort
https://leetcode.com/problems/backspace-string-compare/ https://leetcode.com/problems/squares-of-...
可以把在 偶数位置的 chars 都拿出来 组成一个 string a, 同样的把 在奇数位置上的 chars 都拿出来组成一个 string b,分别把a 和 b 排序一下,再把两个a 和 b组合并且存入 HashSet。 最后只要返回 HashSet 的 size 就可以了。 Java Solution: ...
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solutions using C# for leetcode according to tags of questions, updating everyday. My contact info: guozhennianhua@163.com or my blog: http://blog.csdn.net/daigualu - learn-knowlege/leetcode-csharp
LeetCode Top Interview Questions 557. Reverse Words in a String III (Java版; Easy) 题目描述 Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. ...