Submission #964695

#	Time	Username	Problem	Language	Result	Execution time	Memory
964695		Pring	XORanges (eJOI19_xoranges)	C++17	100 / 100	85 ms	6500 KiB

xoranges

#include <bits/stdc++.h>
using namespace std;

#ifdef MIKU
string dbmc = "\033[1;38;2;57;197;187m", dbrs = "\033[0m";
#define debug(x...) cout << dbmc << "[" << #x << "]: ", dout(x)
void dout() { cout << dbrs << endl; }
template <typename T, typename ...U>
void dout(T t, U ...u) { cout << t << (sizeof...(u) ? ", " : ""); dout(u...); }
#else
#define debug(...) 39
#endif

#define fs first
#define sc second
#define mp make_pair
#define FOR(i, j, k) for (int i = j, Z = k; i < Z; i++)
using ll = long long;
typedef pair<int, int> pii;

const int MXN = 200005;
int n, q, a[MXN];

struct BIT {
    int n, val[MXN];
    void init(int _n) {
        n = _n;
        fill(val + 1, val + n + 1, 0);
    }
    void modify(int id, int v) {
        for (; id <= n; id += (id & -id)) val[id] ^= v;
    }
    int query(int id) {
        int ans = 0;
        for (; id > 0; id -= (id & -id)) ans ^= val[id];
        return ans;
    }
    int query(int l, int r) {
        return query(r) ^ query(l - 1);
    }
} B0, B1;

void miku() {
    cin >> n >> q;
    FOR(i, 1, n + 1) cin >> a[i];
    B0.init(n / 2 + 1);
    B1.init(n / 2 + 1);
    FOR(i, 1, n + 1) {
        if (i & 1) B1.modify(i / 2 + 1, a[i]);
        else B0.modify(i / 2, a[i]);
    }
    while (q--) {
        int t, x, y;
        cin >> t >> x >> y;
        if (t == 1) {
            if (x & 1) B1.modify(x / 2 + 1, y ^ a[x]);
            else B0.modify(x / 2, y ^ a[x]);
            a[x] = y;
        } else {
            if ((y - x) & 1) {
                cout << 0 << '\n';
            } else {
                if (y & 1) cout << B1.query(x / 2 + 1, y / 2 + 1) << '\n';
                else cout << B0.query(x / 2, y / 2) << '\n';
            }
        }
    }
}

int32_t main() {
    cin.tie(0) -> sync_with_stdio(false);
    cin.exceptions(cin.failbit);
    miku();
    return 0;
}

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