find same ints in two file

same.cpp

#include <iostream>
#include <fstream>
#include <bitset>
#include <queue>
#include <vector>
#include <functional>
using namespace std;

bitset<4294967296> bits;
priority_queue<int, vector<int>, greater<int> > res;

int main(int argc, char *argv[]) {
	ifstream inf("file1");
	long long index;
	while(inf>>index) {
		index += 2147483648;
		bits.set(index);  
	}
	ifstream inf2("file2");
	while(inf2>>index) {		
		index += 2147483648;
		if(bits[index]) {
			res.push(index-2147483648);
		}
	}
	while(!res.empty()) {
		cout<<res.top()<<endl;
		res.pop();
	}
	return 0;
}