Submission #892793

#	Time	Username	Problem	Language	Result	Execution time	Memory
892793		noiaint	XORanges (eJOI19_xoranges)	C++17	100 / 100	86 ms	10276 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

#define file ""

#define mp make_pair
#define fi first
#define se second
#define all(x) x.begin(), x.end()

#define bit(x) (1LL << (x))
#define getbit(x, i) (((x) >> (i)) & 1)
#define popcount __builtin_popcountll

mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
    return l + rd() % (r - l + 1);
}

const int N = 1e6 + 5;
const int mod = (int)1e9 + 7; // 998244353;
const int lg = 25; // lg + 1
const int oo = 1e9;
const long long ooo = 1e18;

template<class X, class Y> bool mini(X &a, Y b) {
    return a > b ? (a = b, true) : false;
}
template<class X, class Y> bool maxi(X &a, Y b) {
    return a < b ? (a = b, true) : false;
}
void add(int &a, int b) {
    a += b;
    if (a >= mod) a -= mod;
    if (a < 0) a += mod;
}

int n, q;
int a[N];

struct fenw {
    int n;
    vector<int> bit;

    void init(int _n) {
        n = _n;
        bit.assign(n + 5, 0);
    }

    void update(int u, int c) {
        for (; u <= n; u += u & -u) bit[u] ^= c;
    }

    int get(int u) {
        int res = 0;
        for (; u > 0; u -= u & -u) res ^= bit[u];
        return res;
    }

    int get(int l, int r) {
        return get(r) ^ get(l - 1);
    }
} t[2];


void process() {
    cin >> n >> q;
    for (int i = 1; i <= n; ++i) cin >> a[i];

    t[0].init(n);
    t[1].init(n);

    for (int i = 1; i <= n; ++i) t[i & 1].update(i, a[i]);

    while (q--) {
        int op, x, y;
        cin >> op >> x >> y;
        if (op == 1) {
            t[x & 1].update(x, a[x]);
            a[x] = y;
            t[x & 1].update(x, a[x]);
        } else {
            if ((y - x + 1) & 1) cout << t[x & 1].get(x, y) << '\n';
            else cout << 0 << '\n';
        }
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    #ifdef LOCAL
//    freopen("input.txt", "r", stdin);
    #else
    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);
    #endif

    int tc = 1;
    // cin >> tc;

    while (tc--) {
        process();
    }

    return 0;
}

/*

*/

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