oj.uz

Submission #448785

# Submission time Handle Problem Language Result Execution time Memory
448785 2021-08-01T13:24:05 Z UltraFalcon XORanges (eJOI19_xoranges) C++17
100 / 100
 176 ms 20432 KB 
#include <bits/stdc++.h>
#define int long long

using namespace std;

struct Segtree{
    int n;
    vector<pair<int, int>> data;

    Segtree(const vector<int>& v) {
        n = v.size();
        data = vector<pair<int, int>>(4*n);
        build(v, 1, 0, n);
    }

    public:
    void set(int i, int x) {
        set(i, x, 1, 0, n);
    }

    int get(int beg, int ed) {
        return get(beg, ed, 1, 0, n).first;
    }

    private:
    pair<int, int> get_data(pair<int, int> left, pair<int, int> right, int ll) { // ll = left length
        //cerr << "{" << left.first << " | " << left.second << "}, {" << right.first << " | " << right.second << "}\n";
        //cerr << ll << "\n";
        if (ll <= 0) {
            return right;
        } else if (ll % 2 == 0) {
            return make_pair(left.first ^ right.first, left.second ^ right.second);
        } else {
            return make_pair(left.first ^ right.second, left.second ^ right.first);
        }
    }

    void update(int pos, int ll) {
        data[pos] = get_data(data[pos*2], data[pos*2+1], ll);
    }

    void build(const vector<int>& v, int pos, int left, int right) {
        if (left+1 == right) {
            data[pos] = make_pair(v[left], 0);
        } else {
            int mid = (left + right) / 2;
            build(v, pos*2, left, mid);
            build(v, pos*2+1, mid, right);
            update(pos, mid-left);
        }
    }

    void set(int i, int x, int pos, int left, int right) {
        if (left+1 == right) {
            data[pos] = make_pair(x, 0);
        } else {
            int mid = (left + right) / 2;
            if (i < mid) {
                set(i, x, pos*2, left, mid);
            } else {
                set(i, x, pos*2+1, mid, right);
            }
            update(pos, mid-left);
        }
    }

    pair<int, int> get(int beg, int ed, int pos, int left, int right) {
        if (beg <= left && ed >= right) {
            return data[pos];
        } else if (beg >= right || ed <= left) {
            return make_pair(0, 0);
        } else {
            int mid = (left + right) / 2;
            return get_data(get(beg, ed, pos*2, left, mid),
                            get(beg, ed, pos*2+1, mid, right),
                            mid-max(left, beg));
        }
    }
};

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, q;
    cin >> n >> q;

    vector<int> a(n);
    for (int i=0; i<n; i++) {
        cin >> a[i];
    }

    Segtree seg(a);

    for (int idx=0; idx<q; idx++) {
        int event;
        cin >> event;

        if (event == 1) {
            int i, j;
            cin >> i >> j;

            seg.set(i-1, j);
        } else {
            int l, u;
            cin >> l >> u;

            if ((u - l) % 2 == 1) {
                cout << 0 << "\n";
            } else {
                cout << seg.get(l-1, u) << "\n";
            }
        }
    }
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 316 KB Output is correct

Subtask #2
18.0 / 18.0

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

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 4 ms 716 KB Output is correct
12 Correct 4 ms 716 KB Output is correct
13 Correct 4 ms 716 KB Output is correct
14 Correct 4 ms 716 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 175 ms 15564 KB Output is correct
2 Correct 176 ms 20432 KB Output is correct
3 Correct 175 ms 20416 KB Output is correct
4 Correct 148 ms 20032 KB Output is correct
5 Correct 150 ms 20096 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 4 ms 716 KB Output is correct
12 Correct 4 ms 716 KB Output is correct
13 Correct 4 ms 716 KB Output is correct
14 Correct 4 ms 716 KB Output is correct
15 Correct 175 ms 15564 KB Output is correct
16 Correct 176 ms 20432 KB Output is correct
17 Correct 175 ms 20416 KB Output is correct
18 Correct 148 ms 20032 KB Output is correct
19 Correct 150 ms 20096 KB Output is correct
20 Correct 165 ms 20168 KB Output is correct
21 Correct 167 ms 20140 KB Output is correct
22 Correct 170 ms 20144 KB Output is correct
23 Correct 151 ms 20044 KB Output is correct
24 Correct 150 ms 20036 KB Output is correct