代码(Python3) class Solution: def removeDuplicateLetters(self, s: str) -> str: # last_index[ch] 表示 ch 在 s 中的最后一个出现的位置 last_index: Dict[str, int] = { # 带下标遍历 s 中的字符,更新每个字符最后一次出现的位置 ch: i for i, ch in enumerate(s) } # is_in_stack[ch]...
LeetCode第26题的边界条件有哪些需要注意? 题目描述 Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) ...
https://oj.leetcode.com/problems/remove-duplicates-from-sorted-list-ii/ 题目内容: Given a sorted linked list, delete all nodes that have duplicate numbers, leaving onlydistinctnumbers from the original list. For example, Given1->2->3->3->4->4->5, return1->2->5. Given1->1->1->2...
我们一位一位处理字符串,假设处理到了第i位,并且已经得到当前最优的字符串s,如果第i位已经出现在s中,那么就没必要保留这一位了。 如果没有,考虑s的最后一个字母,如果它比最后第i位小,并且在第i位之后还出现了,那么就删掉,直到s为空或者s的最后一个字母不满足条件,把第i位放到最后。 举样例跑一遍: cbacd...
一个人刷题很难,大家一起刷题就不难了。Leetcode 316 是一道用到贪心算法和栈的中等难度题,本期视频由大叔为大家讲解思路,并演示算法,源代码请在我们的github账号上查询题号:https://github.com/dashu-xiaobai/leetcode/ 喜欢我们的朋友,欢迎你们的点赞关注与订阅!,
Given a sorted linked list, delete all nodes that have duplicate numbers, leaving onlydistinctnumbers from the original list. For example, Given1->2->3->3->4->4->5, return1->2->5. Given1->1->1->2->3, return2->3. 解题思路: ...
LeetCode: 82. Remove Duplicates from Sorted List II 题目描述 Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. For example, Given 1->2->3->3->4->4->5, return 1->2->5...
题目地址:https://leetcode.com/problems/remove-duplicate-letters/ 题目描述 Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexicographical order among all possible results...
LeetCode 82. Remove Duplicates from Sorted List II 简介:给定已排序的链接列表,删除所有具有重复数字的节点,只留下原始列表中的不同数字。 Description Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list....
3.代码示例 1classSolution 2{ 3public: 4stringremoveDuplicateLetters(strings) 5{ 6intn=s.size(); 7vector<int>c(26,0),in(26,0); 8for(inti=0;i<n;i++) ++c[s[i]-'a']; 9stringans; 10for(inti=0;i<n;i++) 11{ 12--c[s[i...