>>112　こんなん？

#include<iostream>
#include <fstream>
#include<vector>
#include<algorithm>
using namespace std;

fstream outputFile("output.txt",ios::out);

void print(const int i){
outputFile << i << std::endl;
}

int main(void){
if(outputFile.fail()) return 1;
fstream inputFile("input.txt",ios::in);
if(inputFile.fail()) return 1;
vector<int> v;
while(!inputFile.eof()){
int i;
inputFile >> i;
vector<int>::iterator it=find(v.begin(),v.end(),i);
if(it==v.end()) v.push_back(i);
}
for_each(v.begin(),v.end(),print);
return 0;
}