Submission #1241051

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241051		azamurai	XORanges (eJOI19_xoranges)	C++20	55 / 100	1096 ms	2064 KiB

xoranges

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
#define Sz(x) (int)x.size()
#define mp make_pair

using namespace std;
typedef long long ll;

const int N = 2e5 + 5;
int n, q, a[N];

void solve() {
	cin >> n >> q;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	while (q--) {
		int tp;
		cin >> tp;
		if (tp == 1) {
			int ind, val;
			cin >> ind >> val;
			a[ind] = val;
		}
		else {
			int l, r;
			cin >> l >> r;
			int ans = 0;
			for (int i = l; i <= r; i++) {
				int k = (r - l + 1);
				int R = min(i-l+1,r-i+1), cnt = 0;
				if (k % 2 == 0) cnt = (R * (R + 1)) + R * (k - 2 * R);
				else {
					if (R == (k + 1) / 2) cnt = R * R;
					else cnt = (R * (R + 1)) + R * (k - 2 * R);
				}
				if (cnt % 2 == 1) ans ^= a[i];
			}
			cout << ans << '\n';
		}
	}
}

signed main() {
	ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

	int t = 1;
	//cin >> t;
	while ( t-- ) {
		solve();
		cout << '\n';
	}
}

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