Question

How to remove non-duplicate characters from string in C++

Answer 1

#include <iostream>
#include <vector>

std::string removeNonDuplicate(const std::string& str) {
    std::vector<char> arr(str.begin(), str.end());
    std::vector<char> duplicateArray;
    
    for (char ch : arr) {
        if (std::count(arr.begin(), arr.end(), ch) > 1) { 
            duplicateArray.push_back(ch);
        }
    }
    
    std::string result(duplicateArray.begin(), duplicateArray.end());
    return result;
}

int main() {
    std::string str = "Bubble Occurrence Mammal c++pro";
    
    std::cout << removeNonDuplicate(str) << std::endl;
}





/*
run:

ubble ccurrece ammal c++r

*/

 

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Answer 2

#include <iostream>
#include <vector>

std::string removeNonDuplicate(const std::string& str) {
    std::vector<char> arr(str.begin(), str.end());
    std::vector<char> duplicateArray;
    
    for (char ch : arr) {
        if (std::count(arr.begin(), arr.end(), ch) > 1 && 
            std::count(duplicateArray.begin(), duplicateArray.end(), ch) == 0) {
            
            duplicateArray.push_back(ch);
        }
    }
    
    std::string result(duplicateArray.begin(), duplicateArray.end());
    return result;
}

int main() {
    std::string str = "Bubble Occurrence Mammal c++pro";
    
    std::cout << removeNonDuplicate(str) << std::endl;
}





/*
run:

uble cram+

*/

 

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