Submission #1219493

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219493		khome	XORanges (eJOI19_xoranges)	C++20	55 / 100	1095 ms	2720 KiB

xoranges

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

const int INF = 1e18;
const int NEU = 0;

int rec(int l, int r, vector<int> &v){
    int ans = 0;
    if ((r-l+1) % 2 == 0) return 0;

    for (int i = l; i <= r; i+=2){
        ans^=v[i];
    }

    return ans;

}

void solve(){
    int n, q; cin >> n >> q;
    vector<int> v(n);

    for (int i = 0 ; i < n; i++) cin >> v[i];

    for (int i = 0; i < q; i++) {
        int p, l, r; cin >> p >> l >> r;
        if (p == 1) {
            v[l-1] = r;
        }

        else {
            cout << rec(l-1, r-1, v) << endl;
        }
    }
    // cout << (5^5) << endl;
}

signed main(){
    ios::sync_with_stdio(0); cin.tie(0);
    int t = 1;

    // cin >> t;
    while(t--)solve();
}

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