#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
int main()
{
using namespace std;
vector<string> input = {"1", "2", "", "", "3", "4" };
vector<string> res;
copy_if(input.begin(), input.end(), back_inserter(res), [] (const string &s)
{
return ! s.empty();
});
for (auto &s : res)
{
cout << s << endl;
}
return 0;
}
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