Submission #1176772

#	Time	Username	Problem	Language	Result	Execution time	Memory
1176772		chikien2009	XORanges (eJOI19_xoranges)	C++20	55 / 100	28 ms	328 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;

void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int n, q, a[5000], b, c, x, y, z;
long long res;

int main()
{
    setup();

    cin >> n >> q;
    for (int i = 0; i < n; ++i)
    {
        cin >> a[i];
    }
    while (q--)
    {
        cin >> b;
        if (b == 1)
        {
            cin >> b >> c;
            a[b - 1] = c;
        }
        else
        {
            cin >> b >> c;
            b--;
            c--;
            res = 0;
            x = c - b + 1;
            for (int i = b; i <= c; ++i)
            {
                y = min(i - b, c - i);
                z = x * (y + 1);
                res ^= (z & 1) * a[i];
            }
            cout << res << "\n";
        }
    }
    return 0;
}

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