Submission #446788

#	Time	Username	Problem	Language	Result	Execution time	Memory
446788		fuad27	XORanges (eJOI19_xoranges)	C++14	38 / 100	609 ms	4632 KiB

xoranges

#include<bits/stdc++.h>
using namespace std;
#define int long long
int fenwick[100000][2] = {0}, v[200010];
void upd(int i, int w, int r) {
	while(i <= 100000) {
		fenwick[i][w] ^= r;
		i += i&(-i);
	}
}
int getXor(int i, int w) {
	int x = 0;
	while(i>0) {
		x^=fenwick[i][w];
		i -= i&(-i);
	}
	return x;
}
int32_t main () {
	int n, q;
	cin >> n >> q;
	for(int i = 1;i<=n;i++) {
		cin >> v[i];
		upd(ceil(i/2.0), i%2, v[i]);
	}
	for(int i = 1;i<=q;i++) {
		int k;
		cin >> k;
		if(k==1) {
			int j, val;
			cin >> j >> val;
			upd(ceil(j/2.0), j%2, (val ^ v[j]));		
		}
		else {
			int l, u;
			cin >> l >> u;
			if((u - l + 1)%2 == 0)cout<<0<<endl;
			else {
				int a = l%2;
				l-=2;
				int ans = getXor(ceil(u/2.0), a) ^ getXor(ceil(l/2.0), a);cout<<ans<<endl;
			}
		}
	}
}

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