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#316 Remove Duplicate Letters

Posted on January 21, 2022January 21, 2022 By thecodepathshala No Comments on #316 Remove Duplicate Letters

Given a string s, remove duplicate letters so that every letter appears once and only once. You must make sure your result is the smallest in lexicographical order among all possible results.

Example 1:

Input: s = "bcabc"
Output: "abc"

Example 2:

Input: s = "cbacdcbc"
Output: "acdb"

Solution :

string removeDuplicateLetters(string s) {
map umap;
map umap1;
string result = “”;
stack st;
for(int i=0; i<s.length(); i++)
umap[s[i]]=i;

    st.push(s[0]);
    umap1[s[0]] = true;

    for(int i=1; i<s.length(); i++) {
        if (umap1[s[i]] == false) {

            while(!st.empty() && st.top() > s[i] && umap[st.top()] > i) {
                umap1[st.top()] = false;
                st.pop();
            }

            st.push(s[i]);
            umap1[s[i]] = true;
        }
    }

    while(!st.empty()) {
        result += st.top();
        st.pop();
    }
    reverse(result.begin(), result.end());
    return result;
}
// function that remove duplicate letters
#include <bits/stdc++.h>
using namespace std;

string removeDuplicateLetters(string s) {
	map<char, int> umap;
	string result;
	for(int i=0; i<s.length(); i++)
		umap[s[i]]++;
	
	for(auto i:umap)
		result.push_back(i.first);
	return result;
}

string removeDuplicateLettersWithLexicographicalOrder(string s) {
	map<char, int> umap;
	map<char, bool> umap1;
	string result = "";
	stack<char> st;
	for(int i=0; i<s.length(); i++)
		umap[s[i]]=i;

	st.push(s[0]);
        umap1[s[0]] = true;
    
    for(int i=1; i<s.length(); i++) {
        if (umap1[s[i]] == false) {

            while(!st.empty() && st.top() > s[i] && umap[st.top()] > i) {
                umap1[st.top()] = false;
                st.pop();
            }

            st.push(s[i]);
            umap1[s[i]] = true;
        }
    }

    while(!st.empty()) {
        result += st.top();
        st.pop();
    }
    reverse(result.begin(), result.end());
    return result;
}

int main()
{
	string s = "cbacdcbc";
	//cout << removeDuplicateLetters(s);
	cout << removeDuplicateLettersWithLexicographicalOrder(s);
	return 0;
}
Algo, Competitive Programming, DS & Algo, GFG, Leetcode Problems Tags:coding interview, leetcode, medium, string

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GFG Problem link : https://www.geeksforgeeks.org/problems/find-median-in-a-stream-1587115620/1

Find C++ code here  -  https://thecodepathshala.in/2025/02/20/gfg-ptod-20-feb-find-median-in-a-stream-medium-level-heap/ds-algo/

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Parenthesis Checker | Valid Parenthesis | GFG PTOD | 21 Feb | Leetcode | GeeksForGeeks
#gfg #ptod #geeksforgeeks 

#geeksforgeeks #gfgpotd #gfg #ptod #dsa #datastructures #algorithm #problemoftheday 

GFG Problem link : https://www.geeksforgeeks.org/problems/find-median-in-a-stream-1587115620/1

Find C++ code here  -  https://thecodepathshala.in/2025/02/20/gfg-ptod-20-feb-find-median-in-a-stream-medium-level-heap/ds-algo/

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Find median in a stream | GFG PTOD | 20 Feb | Leetcode | GeeksForGeeks
#gfg #ptod #geeksforgeeks 

#geeksforgeeks #gfgpotd #gfg #ptod #dsa #datastructures #algorithm #problemoftheday 

GFG Problem link : https://www.geeksforgeeks.org/problems/k-closest-points-to-origin--172242/1

Find C++ code here  -  

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K Closest Points to Origin | GFG PTOD | 18 Feb | Leetcode | GeeksForGeeks
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