Submission #464891

#	Time	Username	Problem	Language	Result	Execution time	Memory
464891		Tsovak	XORanges (eJOI19_xoranges)	C++17	100 / 100	593 ms	14916 KiB

xoranges

// -------------------- Includes -------------------- //
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <stdio.h>
#include <cstdlib>
#include <stdlib.h>
#include <array>
#include <string>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <math.h>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <tuple>
#include <utility>
#include <cassert>
#include <assert.h>
#include <climits>
#include <limits.h>
#include <ctime>
#include <time.h>
#include <random>
#include <chrono>
#include <fstream>
using namespace std;

// -------------------- Typedefs -------------------- //

typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;

// -------------------- Defines -------------------- //

#define pr pair
#define mpr make_pair
#define ff first
#define ss second

#define mset multiset
#define mmap multimap
#define uset unordered_set
#define umap unordered_map
#define umset unordered_multiset
#define ummap unordered_multimap
#define pqueue priority_queue

#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define clr(x) x.clear()

#define pf push_front
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ft front
#define bk back

#define lb lower_bound
#define ub upper_bound
#define bs binary_search

// -------------------- Constants -------------------- //

const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18 + 5);
const ll MOD = ll(1e9 + 7);
const ll MOD2 = ll(998244353);

// -------------------- Functions -------------------- //

void fastio()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	return;
}

void precision(int x)
{
	cout.setf(ios::fixed | ios::showpoint);
	cout.precision(x);
	return;
}

ll gcd(ll a, ll b)
{
	if (a > b) {
		swap(a, b);
	}
	if (a == 0) {
		return b;
	}
	if (a == b) {
		return a;
	}
	return gcd(b % a, a);
}

ll lcm(ll a, ll b)
{
	return a / gcd(a, b) * b;
}

bool is_prime(ll a)
{
	ll i;
	for (i = 2; i * i <= a; i++) {
		if (a % i == 0) {
			return false;
		}
	}
	return true;
}

bool is_square(ll a)
{
	ll b = ll(sqrt(a));
	return (b * b == a);
}

bool is_cube(ll a)
{
	ll b = ll(cbrt(a));
	return (b * b * b == a);
}

int digit_sum(ll a)
{
	int sum = 0;
	while (a) {
		sum += int(a % 10);
		a /= 10;
	}
	return sum;
}

ll binpow(ll a, int b)
{
	ll ans = 1;
	while (b) {
		if ((b & 1) == 1) {
			ans *= a;
		}
		b >>= 1;
		a *= a;
	}
	return ans;
}

ll binpow_by_mod(ll a, ll b, ll mod)
{
	ll ans = 1;
	while (b) {
		if ((b & 1) == 1) {
			ans *= a;
			ans %= mod;
		}
		b >>= 1;
		a *= a;
		a %= mod;
	}
	return ans;
}

ll factorial(int a)
{
	int i;
	ll ans = 1;
	for (i = 2; i <= a; i++) {
		ans *= ll(i);
	}
	return ans;
}

ll factorial_by_mod(int a, ll mod)
{
	int i;
	ll ans = 1;
	for (i = 2; i <= a; i++) {
		ans *= i;
		ans %= mod;
	}
	return ans;
}

// -------------------- Solution -------------------- //

struct node
{
	int ans, xr, xr1, xr2, sz;
};

const int N = 200005;
int a[N];
int n;

node t[N * 4];

node merge(node a, node b, int tl, int m, int tr)
{
	node res;
	res.ans = (a.ans ^ b.ans);
	res.xr = (a.xr ^ b.xr);
	res.xr1 = (a.xr1 ^ b.xr1);
	res.xr2 = (a.xr2 ^ b.xr2);
	res.sz = a.sz + b.sz;
	if (a.sz % 2 == 1) {
		if (tr % 2 == 1) {
			res.ans ^= b.xr1;
		}
		else {
			res.ans ^= b.xr2;
		}
	}
	if (b.sz % 2 == 1) {
		if (tl % 2 == 1) {
			res.ans ^= a.xr1;
		}
		else {
			res.ans ^= a.xr2;
		}
	}
	return res;
}

void bld(int tl, int tr, int pos)
{
	if (tl == tr) {
		t[pos].ans = t[pos].xr = a[tl];
		t[pos].sz = 1;

		if (tl % 2 == 1) {
			t[pos].xr1 = a[tl];
			t[pos].xr2 = 0;
		}
		else {
			t[pos].xr1 = 0;
			t[pos].xr2 = a[tl];
		}
		return;
	}

	int m = (tl + tr) / 2;
	bld(tl, m, pos * 2);
	bld(m + 1, tr, pos * 2 + 1);

	t[pos] = merge(t[pos * 2], t[pos * 2 + 1], tl, m, tr);
	return;
}

void upd(int tl, int tr, int ind, int x, int pos)
{
	if (tl == tr) {
		t[pos].ans = t[pos].xr = x;

		if (tl % 2 == 1) {
			t[pos].xr1 = x;
			t[pos].xr2 = 0;
		}
		else {
			t[pos].xr1 = 0;
			t[pos].xr2 = x;
		}
		return;
	}

	int m = (tl + tr) / 2;
	if (ind <= m) {
		upd(tl, m, ind, x, pos * 2);
	}
	else {
		upd(m + 1, tr, ind, x, pos * 2 + 1);
	}

	t[pos] = merge(t[pos * 2], t[pos * 2 + 1], tl, m, tr);
	return;
}

node qry(int tl, int tr, int l, int r, int pos)
{
	if (tl == l && tr == r) {
		return t[pos];
	}

	int m = (tl + tr) / 2;
	if (r <= m) {
		return qry(tl, m, l, r, pos * 2);
	}
	if (l > m) {
		return qry(m + 1, tr, l, r, pos * 2 + 1);
	}
	return merge((qry(tl, m, l, m, pos * 2)), (qry(m + 1, tr, m + 1, r, pos * 2 + 1)), l, m, r);
}

void solve()
{
	int i, j;
	int q;
	int type, ind, x, l, r, res;
	cin >> n >> q;
	for (i = 1; i <= n; i++) {
		cin >> a[i];
	}
	bld(1, n, 1);
	for (i = 1; i <= q; i++) {
		cin >> type;
		if (type == 1) {
			cin >> ind >> x;
			upd(1, n, ind, x, 1);
		}
		else {
			cin >> l >> r;
			res = qry(1, n, l, r, 1).ans;
			cout << res << endl;
		}
	}
	return;
}

void precalc()
{
	return;
}

int main()
{
	fastio();

	precalc();

	int tests = 1, tc;
	//cin >> tests;
	for (tc = 1; tc <= tests; tc++) {
		solve();
	}

	//cout << db(clock()) / CLOCKS_PER_SEC << endl;

	return 0;
}

/*
	# # # #   # # # #   # # # #   #       #    #       #     #
	   #      #         #     #    #     #    # #      #   #
	   #      # # # #   #     #     #   #    #   #     # #
	   #            #   #     #      # #    # # # #    #   #
	   #      # # # #   # # # #       #    #       #   #     #
*/

Compilation message (stderr)

xoranges.cpp: In function 'void solve()':
xoranges.cpp:316:9: warning: unused variable 'j' [-Wunused-variable]
  316 |  int i, j;
      |         ^

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