Submission #642342

#	Time	Username	Problem	Language	Result	Execution time	Memory
642342		moday_morning	XORanges (eJOI19_xoranges)	C++17	55 / 100	1085 ms	4404 KiB

xoranges

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

signed main() {
	int n, q; 
	cin >> n >> q;
	vector <int> a(n+3);
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
    while (q--) {
        int type;   
		cin >> type;
        if (type == 1) {
            int i, j; 
			cin >> i >> j;
            a[i] = j;
        }
        else if (type == 2) {
            int l, r; 
			cin >> l >> r;
			int main = 0;
			for (int i = l; i <= r; i++) {
				int x = (i - l + 1) * (r - i + 1);
				if (x % 2 == 1) {
					main ^= a[i];
				}
			}
			cout << main << "\n";
        }
    }
}

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