Submission #1241029

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241029		azamurai	XORanges (eJOI19_xoranges)	C++20	30 / 100	1094 ms	3400 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;
	vector <int> pref(n+1,0);
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		pref[i] = (pref[i-1] ^ a[i]);
	}
	while (q--) {
		int tp;
		cin >> tp;
		if (tp == 1) {
			int ind, val;
			cin >> ind >> val;
			a[ind] = val;
			for (int i = 1; i <= n; i++) {
				pref[i] = (pref[i-1] ^ a[i]);
			}
		}
		else {
			int l, r;
			cin >> l >> r;
			int ans = 0;
			for (int i = 1; i <= r-l+1; i++) {
				for (int j = l; j+i-1 <= r; j++) {
					ans ^= (pref[j+i-1] ^ pref[j-1]);
				}
			}
			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: 0 / 25
• Subtask 4: 0 / 20
• Subtask 5: 0 / 25