Submission #1139576

#	Time	Username	Problem	Language	Result	Execution time	Memory
1139576		Muhammet	XOR Sum (info1cup17_xorsum)	C++20	0 / 100	54 ms	4164 KiB

xorsum

#include "bits/stdc++.h"

using namespace std;

#define ll long long
#define SZ(s) (int)s.size()
#define ff first
#define ss second

const int N = (4e3 + 5);

int T, n, m, vis[N+1];

signed main(){
	ios::sync_with_stdio(false); cin.tie(nullptr);

	cin >> n;
	vector <int> a(n);
	for(int i = 0; i < n; i++){
		cin >> a[i];
		vis[a[i]]++;
	}
	int ans = 0;
	for(int i = 0; i < N; i++){
		for(int j = 0; j < N; j++){
			if(!vis[i] or !vis[j]) continue;
			if((vis[i]*vis[j]) % 2) ans ^= (i+j);
		}
	}
	cout << ans << '\n';

	return 0;
}

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