Submission #522864

#	Time	Username	Problem	Language	Result	Execution time	Memory
522864		n3rm1n	XOR Sum (info1cup17_xorsum)	C++17	7 / 100	10 ms	716 KiB

xorsum

#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;
}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23