oj.uz

Submission #919254

# Submission time Handle Problem Language Result Execution time Memory
919254 2024-01-31T13:34:57 Z raphaelp XORanges (eJOI19_xoranges) C++14
100 / 100
 467 ms 12588 KB 
#include <bits/stdc++.h>
using namespace std;
class SegmentTree
{
private:
    vector<int> st;
    int N;
    int l(int x) { return (x << 1); }
    int r(int x) { return (x << 1) + 1; }
    void update(int pos, int val, int L, int R, int x)
    {
        if (pos < L || pos > R)
            return;
        if (L == R)
        {
            st[x] = val;
        }
        else
        {
            int m = (L + R) / 2;
            update(pos, val, L, m, l(x));
            update(pos, val, m + 1, R, r(x));
            st[x] = st[l(x)] ^ st[r(x)];
        }
    }
    int RSQ(int L, int R, int a, int b, int x)
    {
        if (L > b || R < a)
            return 0;
        if (L >= a && R <= b)
            return st[x];
        int m = (L + R) / 2;
        return RSQ(L, m, a, b, l(x)) ^
               RSQ(m + 1, R, a, b, r(x));
    }

public:
    SegmentTree(int x)
    {
        N = pow(2, ceil(log2(x)));
        st.assign(3 * N, 0);
    }
    void update(int pos, int val)
    {
        update(pos, val, 0, N - 1, 1);
    }
    int RSQ(int a, int b)
    {
        return RSQ(0, N - 1, a, b, 1);
    }
};
int main()
{
    int N, Q;
    cin >> N >> Q;
    SegmentTree odd(N), even(N);
    for (int i = 0; i < N; i++)
    {
        int x;
        cin >> x;
        if (i % 2)
            odd.update(i, x);
        else
            even.update(i, x);
    }
    for (int i = 0; i < Q; i++)
    {
        int type;
        cin >> type;
        if (type == 1)
        {

            int x, val;
            cin >> x >> val;
            x--;
            if (x % 2)
                odd.update(x, val);
            else
                even.update(x, val);
        }
        else
        {
            int a, b;
            cin >> a >> b;
            a--, b--;
            if ((b - a) % 2 == 1)
                cout << 0 << '\n';
            else
            {
                if (a % 2)
                    cout << odd.RSQ(a, b) << '\n';
                else
                    cout << even.RSQ(a, b) << '\n';
            }
        }
    }
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 2 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 2 ms 348 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 2 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 2 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 2 ms 348 KB Output is correct
11 Correct 9 ms 600 KB Output is correct
12 Correct 8 ms 600 KB Output is correct
13 Correct 12 ms 600 KB Output is correct
14 Correct 11 ms 600 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 467 ms 12588 KB Output is correct
2 Correct 466 ms 12404 KB Output is correct
3 Correct 462 ms 12496 KB Output is correct
4 Correct 454 ms 12168 KB Output is correct
5 Correct 451 ms 12368 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 2 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 2 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 2 ms 348 KB Output is correct
11 Correct 9 ms 600 KB Output is correct
12 Correct 8 ms 600 KB Output is correct
13 Correct 12 ms 600 KB Output is correct
14 Correct 11 ms 600 KB Output is correct
15 Correct 467 ms 12588 KB Output is correct
16 Correct 466 ms 12404 KB Output is correct
17 Correct 462 ms 12496 KB Output is correct
18 Correct 454 ms 12168 KB Output is correct
19 Correct 451 ms 12368 KB Output is correct
20 Correct 383 ms 12376 KB Output is correct
21 Correct 366 ms 12540 KB Output is correct
22 Correct 370 ms 12204 KB Output is correct
23 Correct 441 ms 12216 KB Output is correct
24 Correct 435 ms 12164 KB Output is correct