Submission #596770

#	Time	Username	Problem	Language	Result	Execution time	Memory
596770		Cookie	XORanges (eJOI19_xoranges)	C++14	55 / 100	23 ms	724 KiB

xoranges

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define vt vector
#define pb push_back
ll a[5001];
int n, q;
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n >> q;
	for(int i = 0; i < n; i++)cin >> a[i];
	for(int i = 0; i < q; i++){
	    int qq; cin >> qq;
	    if(qq == 2){
	    int l, r; cin >> l >> r;
	    ll ans = 0;
	    l--; r--;
	    for(int j = l; j <= r; j++){
	        int val = (j - l + 1) * (r - j + 1);
	        if(val & 1)ans ^= a[j];
	    }
	    cout << ans << "\n";
	    }else{
	        int id, x; cin >> id >> x; a[--id] = x;
	    }
	}
}

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