#include<iostream>
#include<vector>
#include<algorithm>
#include<iterator>
 
using namespace std;
 
int main()
{
    std::vector<char> vChar;
    for (char str; (str = cin.get()!='\n');)//std::getline(std::cin, str);)
            vChar.push_back(std::move(str));
 
    std::unique(vChar.begin(), vChar.end());
 
    /*for(std::vector<char>::iterator it = vChar.begin(); it!=vChar.end(); ++it)
    	cout << it << endl;*/
    copy(vChar.begin(),vChar.end(),ostream_iterator<char>(std::cout));
 
    system("pause");
    return 0;
}

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

aGVsbG8gd29ybGQhCg==

hello world!