제출 #966219

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
966219		vjudge1	XORanges (eJOI19_xoranges)	C++17	100 / 100	112 ms	16904 KiB

xoranges

#include<bits/stdc++.h>
#define INF 1e9
#define fi first
#define se second
#define FOR(i, k, n) for(int i = k; i <= n; i++)
#define FOR1(i, k, n) for(int i = k; i >= n; i--)
#define pb push_back
#define fastio ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define vi vector<int>
#define pii pair<int, int>
#define vii vector<pii>
#define ll long long
#define vll vector<ll>
#define pll pair<ll, ll>
#define re return 0
#define mii map<int, int>
#define input "DANCE.inp"
#define output "DANCE.out"
#define rf 	freopen(input, "r", stdin); freopen(output, "w", stdout)
using namespace std;
const int maxn = 2e5 + 5;
const int mod = 1e9 + 7;
pll T[maxn * 4];
int a[maxn];
void build(int id, int l, int r)
{
	if(l == r)
	{
		if(l % 2)
			T[id].fi = a[l], T[id].se = 0;
		else
			T[id].se = a[l], T[id].fi = 0;
		return;
	}
	int mid = (l + r) / 2;
	build(id * 2, l, mid);
	build(id * 2 + 1, mid + 1, r);
	T[id].fi = T[id * 2].fi ^ T[id * 2 + 1].fi;
	T[id].se = T[id * 2].se ^ T[id * 2 + 1].se;
}
void update(int id, int l, int r, int pos, int val)
{
	if(l == r)
	{
		if(pos % 2)
			T[id].fi = val;
		else
			T[id].se = val;
		return;
	}
	int mid = (l + r) / 2;
	if(pos <= mid)
		update(id * 2, l, mid, pos, val);
	else
		update(id * 2 + 1, mid + 1, r, pos, val);
	T[id].fi = T[id * 2].fi ^ T[id * 2 + 1].fi;
	T[id].se = T[id * 2].se ^ T[id * 2 + 1].se;
}
ll get1(int id, int l, int r, int u, int v)
{
	if(l > v || r < u)
		return 0;
	if(l >= u && r <= v)
		return T[id].fi;
	int mid = (l + r) / 2;
	return get1(id * 2, l, mid, u, v) ^ get1(id * 2 + 1, mid + 1, r, u, v);
}
ll get2(int id, int l, int r, int u, int v)
{
	if(l > v || r < u)
		return 0;
	if(l >= u && r <= v)
		return T[id].se;
	int mid = (l + r) / 2;
	return get2(id * 2, l, mid, u, v) ^ get2(id * 2 + 1, mid + 1, r, u, v);
}
int main()
{
	fastio;
	int n, q;
	cin >> n >> q;
	FOR(i, 1, n)
		cin >> a[i];
	build(1, 1, n);
	while(q--)
	{
		int op;
		cin >> op;
		if(op == 1)
		{
			int pos, val;
			cin >> pos >> val;
			update(1, 1, n, pos, val);
		}
		else
		{
			int l, r;
			cin >> l >> r;
			if((r - l + 1) % 2 == 0)
			{
				cout << "0\n";
				continue;
			}
			if(l % 2)
				cout << get1(1, 1, n, l, r) << "\n";
			else
				cout << get2(1, 1, n, l, r) << '\n';
		}
	}
	re;
}

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