Given"bcabc"Return"abc"Given"cbacdcbc"Return"acdb" 思想是:维护一个栈Stack<Character> st来存最后的结果,先scan一次input,构造一个字典int[] count,记录每个char出现次数。然后进行第二次scan,用st来存最后在string里的character 这次scan的时候,需要维护一个boolean[] visited, 来记录每个字符是否在当前储存结...
s.erase(remove(s.begin(), s.end(), theCharacterNeedtoRemove), s.end()); 其中remove函数需要使用algorithm库文件。算法复杂度为O(26 * n) = O(n) 1classSolution {2public:3stringremoveDuplicateLetters(strings) {4vector<int> alp(26, -1);5for(inti =0, n = s.size(); i < n; i++...
public intfirstUniqChar(String s){Map<Character,Integer>map=newLinkedHashMap<>();Set<Character>set=newHashSet<>();for(int i=0;i<s.length();i++){if(set.contains(s.charAt(i))){// 每次在set里面check是否有重复的字母if(map.get(s.charAt(i))!=null){map.remove(s.charAt(i));}}els...
1classSolution {2func longestDupSubstring(_ S: String) ->String {3varsa:[Int] = suffixArray(Array(S),26)4let n:Int =S.count5varlcp:[Int] =buildLCP(Array(S), sa)6varisa:[Int] = [Int](repeating:0,count:n)7foriin0..<n {isa[sa[i]] =i}8varmax:Int =09vararg:Int = -110...
leetcode 217. Contains Duplicate Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct....
1 class Solution { 2 public String removeDuplicateLetters(String s) { 3 int [] last = new int[26]; 4 for(int i = 0; i<s.length(); i++){ 5 last[s.charAt(i)-'a'] = i; 6 } 7 8 Stack<Character> stk = new Stack<>(); 9 boolean [] used = new boolean[26]; 10 for...
{16ifgroup.count >1{17result.append(group)18}19}2021returnresult22}2324func parse(info: String) ->[(String, String)] {25varcomponents = info.components(separatedBy:"")26let path =components.removeFirst()2728varresult =[(String, String)]()2930let splitCharSet = CharacterSet(charactersIn:"(...
}privateintfindLetter(String s, StringBuilder res, HashMap<Character, ArrayList<Integer>> hm, ArrayList<Character>reference) {intm = 0;for(inti = 0; i < reference.size(); i++) { m= hm.get(reference.get(i)).get(0);intj = i+1;for(; j < reference.size(); j++) { ...
packageleetcode.RemoveDumplicateLetters316;importjava.util.Stack;publicclassSolution {publicString removeDuplicateLetters( String s ) { StringBuilder ret=newStringBuilder();if( s ==null|| s.length() < 1)returnret.toString(); Stack<Character> stack =newStack<Character>();int[] f =newint[ 26]...
1classSolution {2publicString removeDuplicateLetters(String s) {3int[] count =newint[26];4for(inti = 0; i < s.length(); i++) {5count[s.charAt(i) - 'a']++;6}78Stack<Character> stack =newStack<>();9boolean[] seen =newboolean[26];10for(inti = 0; i < s.length(); i+...