#include<bits/stdc++.h>
using namespace std;

signed main()
{
	int a,b;
   cin>>a>>b;
	a^=b;
	b^=a;
	a^=b;
	cout<<a<<" "<<b;
	return 0;
}

和

#include<bits/stdc++.h>
using namespace std;

signed main()
{
	int a,b;
   cin>>a>>b;
	swap(a,b);
	cout<<a<<" "<<b;
	return 0;
}

我测试着swap更快一点，是误差吗