Question

How to remove all duplicate elements from vector in C++

Answer 1

#include <iostream>
#include <vector>
#include <algorithm>
 
using namespace std;
 
int main() {
    vector<int> vec{ 1, 1, 2, 3, 4, 4, 4, 5, 6, 6, 7, 7, 7, 7 }; 
  
    std::sort(vec.begin(), vec.end());
    for (int i = 0; i < vec.size() - 1; i++) {
        if (vec[i] == vec[i + 1]) {
            vec.erase(vec.begin() + i);
            i--;
        }
    }
     
    for (int i = 0; i < vec.size(); i++)
        cout << vec[i] << endl;
        
    return 0;
}
 
 
/*
run:
 
1
2
3
4
5
6
7
 
*/

 

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