Submission #464068

#	Time	Username	Problem	Language	Result	Execution time	Memory
464068		gagik_2007	XORanges (eJOI19_xoranges)	C++17	30 / 100	1089 ms	17748 KiB

xoranges

#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <deque>
#include <stack>
#include <iomanip>
#include <unordered_set>
using namespace std;

#define ll long long
#define ff first
#define ss second

ll n, k, sum, m, s, f;
ll MOD = 1e9 + 7;
ll ttt;
ll a[200007];

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin >> n >> k;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	for (int j = 0; j < k; j++) {
		int id, c, d;
		cin >> id >> c >> d;
		if (id == 1) {
			a[c] = d;
		}
		else {
			map<ll, ll>cur;
			unordered_set<ll>nw;
			ll ans = 0;
			for (int i = c; i <= d; i++) {
				int f = i - c + 1;
				int m = 2 * n - c - d - 1;
				int x = min(f, m - f + 1);
				cur[a[i]] += (x - 1) * x + (m - 2 * (x - 1)) * x;
				nw.insert(a[i]);
				//cout << a[i] << " " << cur[a[i]] << endl;
			}
			for (auto i : nw) {
				if (cur[i] % 2 != 0) {
					ans = ans ^ i;
				}
			}
			cout << ans << endl;
		}
	}
	return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 0 / 25
• Subtask 4: 0 / 20
• Subtask 5: 0 / 25