代码(Go) func removeDuplicateLetters(s string) string { // lastIndex[ch] 表示 ch 在 s 中的最后一个出现的位置 lastIndex := make(map[rune]int) // 带下标遍历 s 中的字符 for i, ch := range s { // 更新每个字符最后一次出现的位置 lastIndex[ch] = i } // isInStack[ch] 表示 ch ...
Remove Duplicate Letters -- LeetCode 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. Example: Given"bcabc" Return"abc...
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...
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Leetcode: Remove Duplicate Letters 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....
* https://discuss.leetcode.com/topic/31404/a-short-o-n-recursive-greedy-solution * 贪心算法 * */ public class Solution { public String removeDuplicateLetters(String s) { if(s==null || s.length()<=0) return ""; else { int[] count=new int[26]; ...
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...
Can you solve this real interview question? Remove All Adjacent Duplicates in String II - You are given a string s and an integer k, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them, causing the left and th
原题链接在这里:https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string/ 题目: Given a stringSof lowercase letters, aduplicate removalconsists of choosing two adjacent and equal letters, and removing them. We repeatedly make duplicate removals on S until we no longer can. ...
[LeetCode] Remove Duplicates from Sorted Array II 有序数组中去除重复项之二 Follow up for "Remove Duplicates":What if duplicates are allowed at most twice? For example,Given sorted array A = [1,1,1,2,2,3], Your function should return length = 5, and A is now [1,1,2,2,3]. 这...