제출 #522864

#제출 시각아이디문제언어결과실행 시간메모리
522864n3rm1nXOR Sum (info1cup17_xorsum)C++17
7 / 100
10 ms716 KiB
#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
const int MAXN = 4 * 1e3 + 10;
void speed()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
}
int n, a[MAXN];
int ans;
void read()
{
    cin >> n;
    cin >> a[1];
    ans = a[1]*2;
    for (int i = 2; i <= n; ++ i)
    {
        cin >> a[i];
        ans = (ans ^ (a[i]*2));
    }
}
void solve_N2()
{
    for (int i = 1; i <= n; ++ i)
    {
        for (int j = i+1; j <= n; ++ j)
        {
            ans = (ans ^ (a[i]+a[j]));
        }
    }
    cout << ans << endl;
}
int main()
{
	speed();
	read();
	solve_N2();
	return 0;
}
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