Submission #437389

#	Time	Username	Problem	Language	Result	Execution time	Memory
437389		MinhQNgo	XORanges (eJOI19_xoranges)	C++17	18 / 100	39 ms	460 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;

const int N = 505;

int a[N];
long long p[N];

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

    int n, q;
    cin >> n >> q;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        p[i] = p[i - 1] ^ a[i];
    }
    for (int _ = 0; _ < q; _++) {
        int t, x, y;
        cin >> t >> x >> y;
        if (t == 1) a[x] = y;
        else {
            long long ans = 0;
            for (int l = 1; l <= y - x + 1; l++) {
                long long cur_xor = 0;
                for (int i = x; i + l - 1 <= y; i++) {
                    cur_xor ^= p[i + l - 1] ^ p[i - 1];
                }
                ans ^= cur_xor;
            }
            cout << ans << '\n';
        }
    }
}

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