Find and print duplicate words in std::vector using STL functions using C++.

Consider we have a list of strings. The list has some duplicate strings. We have to check which strings are occurred more than once. Suppose the string list is like [“Hello”, “Kite”, “Hello”, “C++”, “Tom”, “C++”]

Here we will use the hashing technique, so create an empty hash table, then traverse each string, and for each string, s is already present in the hash, then display the string, otherwise insert into the hash.

Example

 Live Demo

#include<iostream> #include<vector> #include<unordered_set> using namespace std; void displayDupliateStrings(vector<string> strings) {    unordered_set<string> s;    bool hasDuplicate = false;    for (int i = 0; i<strings.size(); i++) {       if (s.find(strings[i]) != s.end()) {          cout << strings[i] << endl;          hasDuplicate = true;       }       else          s.insert(strings[i]);    }    if (!hasDuplicate)       cout << "No Duplicate string has found" << endl; } int main() {    vector<string>strings{"Hello", "Kite", "Hello", "C++", "Tom", "C++"};    displayDupliateStrings(strings); }

Output

Hello C++