Submission #761159

#	Time	Username	Problem	Language	Result	Execution time	Memory
761159		LucaLucaM	XORanges (eJOI19_xoranges)	C++17	55 / 100	1082 ms	1672 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;

const int NMAX = 2e5;

int a[NMAX + 5];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, q;
    cin >> n >> q;
    for (int i=1; i<=n; i++)
        cin >> a[i];
    while (q--)
    {
        int op, x, y;
        cin >> op >> x >> y;
        if (op == 1)
            a[x] = y;
        else
        {
            int ans = 0;
            if (x % 2 != y % 2)
            {
                cout << "0\n";
                continue;
            }
            for (int i=x; i<=y; i++)
            {
                if ((i - x + 1) % 2 == 1 && (y - i + 1) % 2 == 1)
                    ans ^= a[i];
            }
            cout << ans << '\n';
        }
    }
    return 0;
}

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