Submission #1249186

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249186		al95ireyiz	XORanges (eJOI19_xoranges)	C++20	38 / 100	52 ms	6340 KiB

xoranges

//*** Bismillah ***//
#pragma GCC optimize("O3", "fast-math", "unroll-loops", "no-stack-protector")
#include <bits/stdc++.h>
using namespace std;
#if !defined(ONLINE_JUDGE) and !defined(EVAL)
#include "template/debug.h"
#else
#define d(x...)
#endif
#define fr first
#define er erase
#define sc second
#define in insert
#define ll long long
#define pb push_back
#define vll vector<ll>
#define pll pair<ll,ll>
#define ull unsigned ll
#define vpll vector<pll>
#define len(x) (ll) x.size()
#define all(x) x.begin(),x.end()
const ll INF = 1e9;
const ll INFL = 1e18;
const ll MOD = 1e9+7;
// const ll MOD = 998244353;
const ll maxn = 2e5+5;
ll n,m,k=0;
ll a[maxn], fw[maxn][2];
ll get(ll t, ll i){
    ll cv = 0;
    for(; i > 0; i -= i & -i) cv ^= fw[i][t];
    return cv;
}
void upd(ll t, ll i, ll val){
    for(; i < maxn; i += i & -i) fw[i][t] ^= val;
}
void _(ll &tt){
    cin >> n >> m;
    for(ll i = 1; i <= n; i ++){
        cin >> a[i];
        upd(i % 2, i, a[i]);
    }
    for(ll i = 1, t; i <= m; i ++){
        cin >> t;
        if(t == 1){
            ll x, y;
            cin >> x >> y;
            upd(x % 2, x, y - a[x]);
            a[x] = y;
        }
        else{
            ll l, r;
            cin >> l >> r;
            if(l % 2 != r % 2){
                cout << 0 << '\n';
                continue;
            }
            cout << (get(l % 2, r) ^ get(l % 2, l - 1)) << '\n';
        }
    }
}
signed main() {
    ll tm = clock();
    cin.tie(0)->sync_with_stdio(0);
    ll t = 1;
    // cin >> t;
    for(ll tt = 1; tt <= t; tt ++) {
        _(tt);
    }
    cerr << "\n\033[1;31mTime: \033[1;30m" \
         << (double)(clock()-tm)/1000000 << "\033[1;32m seconds\n";
}

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