oj.uz

Submission #447271

# Submission time Handle Problem Language Result Execution time Memory
447271 2021-07-25T16:54:31 Z bigo XORanges (eJOI19_xoranges) C++14
100 / 100
 764 ms 31548 KB 
#include <bits/stdc++.h>
#include <cmath>
using namespace std;
typedef unsigned long long ll;
const ll INF = 1e9, MOD = 1e9 + 7;
struct Seg {
	ll val = INF;
	ll l, r, mid; // responisble for [l,r)
	Seg* lp, * rp;
	Seg(ll l, ll r) : l(l), r(r), mid((l + r) / 2) {
		if (l + 1 < r) {
			lp = new Seg(l, mid);
			rp = new Seg(mid, r);
		}
	}
	void pull() {
		val = lp->val ^ rp->val;
	}
	void update(ll i, ll x) {
		if (l + 1 == r) {
			val = x;
			return;
		}
		if (i < mid) lp->update(i, x);
		else rp->update(i, x);
		pull();
	}
	ll query(ll a, ll b) { // xor of [a,b)
		if (a >= r || b <= l) return 0; // [a,b) and [l,r) are disjoll
		if (a <= l && r <= b) return val; // [l,r) is inside [a,b)
		return lp->query(a, b) ^ rp->query(a, b);
	}
};
int main() {
	ll n, q;
	cin >> n >> q;
	Seg seg(0, n / 2 + 1);
	Seg seg1(0, n / 2 + 1);
	ll g;
	for (ll i = 0; i < n; i++) {
		cin >> g;
		if ((i + 1) % 2 == 1) {
			seg1.update(i / 2, g);
		}
		else
			seg.update(i / 2, g);
	}
	while (q--) {
		ll op;
		cin >> op;
		if (op == 1) {
			ll i, j;
			cin >> i >> j;
			i--;
			if ((i + 1) % 2 == 1)
				seg1.update(i / 2, j);
			else
				seg.update(i / 2, j);
		}
		else {
			ll l, r;
			cin >> l >> r;
			l--, r--;
			if ((r - l + 1) % 2 == 0)
				cout << 0 << endl;
			else {
				if ((l + 1) % 2 == 1) {
					cout << seg1.query(l / 2, r / 2 + 1) << endl;
				}
				else {
					cout << seg.query(l / 2, r / 2 + 1) << endl;
				}
			}
		}
	}
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 2 ms 332 KB Output is correct
3 Correct 2 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 332 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 2 ms 332 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 2 ms 332 KB Output is correct
10 Correct 2 ms 332 KB Output is correct
11 Correct 13 ms 972 KB Output is correct
12 Correct 15 ms 1044 KB Output is correct
13 Correct 18 ms 1028 KB Output is correct
14 Correct 16 ms 1032 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 764 ms 27152 KB Output is correct
2 Correct 758 ms 31548 KB Output is correct
3 Correct 759 ms 31400 KB Output is correct
4 Correct 663 ms 30976 KB Output is correct
5 Correct 661 ms 30916 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 2 ms 332 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 2 ms 332 KB Output is correct
10 Correct 2 ms 332 KB Output is correct
11 Correct 13 ms 972 KB Output is correct
12 Correct 15 ms 1044 KB Output is correct
13 Correct 18 ms 1028 KB Output is correct
14 Correct 16 ms 1032 KB Output is correct
15 Correct 764 ms 27152 KB Output is correct
16 Correct 758 ms 31548 KB Output is correct
17 Correct 759 ms 31400 KB Output is correct
18 Correct 663 ms 30976 KB Output is correct
19 Correct 661 ms 30916 KB Output is correct
20 Correct 597 ms 31088 KB Output is correct
21 Correct 602 ms 31148 KB Output is correct
22 Correct 615 ms 31204 KB Output is correct
23 Correct 641 ms 31044 KB Output is correct
24 Correct 661 ms 31060 KB Output is correct