Submission #389229

#	Time	Username	Problem	Language	Result	Execution time	Memory
389229		rk42745417	XOR Sum (info1cup17_xorsum)	C++17	0 / 100	260 ms	4172 KiB

xorsum

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

#define EMT ios::sync_with_stdio(0); cin.tie(0);
using ll = int64_t;
using ull = uint64_t;
using uint = uint32_t;
using ld = long double;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9 + 7;
const ll LINF = 1e18;
const double EPS = 1e-9;

const int N = 4e3 + 25;

int cnt[N];

signed main() {
	int n;
	cin >> n;
	vector<int> arr(n);
	for(int i = 0; i < n; i++)
		cin >> arr[i], cnt[arr[i]]++;
	int ans = 0;
	for(int i = 0; i < N; i++) {
		for(int j = i + 1; j < N; j++)
			if((cnt[i] & 1) && (cnt[j] & 1))
				ans ^= i + j;
		if(1 <= cnt[i] && cnt[i] <= 3)
			ans ^= i + i;
	}
	cout << ans << '\n';
}

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