oj.uz

Submission #445469

# Submission time Handle Problem Language Result Execution time Memory
445469 2021-07-18T07:26:15 Z omg XORanges (eJOI19_xoranges) C++17
100 / 100
 633 ms 11224 KB 
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
typedef vector<int> vi;
typedef vector<vi> vvi;
 
struct Seg{
    vi seg;
    int n;
    Seg(int m) {
        for (n = 1; n < m; n <<= 1);
        seg.resize(2 * n);
    }
    void update(int i, int x) {
        seg[i += n] = x;
        for (i >>= 1; i; i >>= 1) seg[i] = seg[2 * i] ^ seg[2 * i + 1];
    }
    int query(int l, int r) {
        int ans = 0;
        for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
            if (l & 1) ans ^= seg[l++];
            if (r & 1) ans ^= seg[--r];
        }
        return ans;
    }
};
 
int main() {
    int n, q;
    cin >> n >> q;
    vi a(n + 1);
    vector<Seg> seg(2, Seg(n + 1));
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        seg[i & 1].update(i, a[i]);
    }
    while (q--) {
        int type;
        cin >> type;
        if (type == 1) {
            int i, x;
            cin >> i >> x;
            seg[i & 1].update(i, x);
            continue;
        }
        int l, r;
        cin >> l >> r;
        if (!((r - l + 1) & 1)) {
            cout << 0 << '\n';
            continue;
        }
        cout << seg[(l & 1)].query(l, r + 1) << '\n';
//        int ans = 0;
//        for (int i = 1; i <= r - l + 1; i++) {
//            for (int j = l; j + i - 1 <= r; j++) {
//                for (int k = j; k < j + i; k++) {
//                    ans ^= a[k];
//                }
//            }
//        }
//        cout << ans << '\n';
    }
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 292 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 204 KB Output is correct
2 Correct 2 ms 300 KB Output is correct
3 Correct 2 ms 204 KB Output is correct
4 Correct 2 ms 204 KB Output is correct
5 Correct 2 ms 204 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 292 KB Output is correct
6 Correct 2 ms 204 KB Output is correct
7 Correct 2 ms 300 KB Output is correct
8 Correct 2 ms 204 KB Output is correct
9 Correct 2 ms 204 KB Output is correct
10 Correct 2 ms 204 KB Output is correct
11 Correct 12 ms 588 KB Output is correct
12 Correct 11 ms 588 KB Output is correct
13 Correct 15 ms 588 KB Output is correct
14 Correct 16 ms 744 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 633 ms 11220 KB Output is correct
2 Correct 622 ms 11176 KB Output is correct
3 Correct 632 ms 11224 KB Output is correct
4 Correct 607 ms 10836 KB Output is correct
5 Correct 608 ms 10944 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 292 KB Output is correct
6 Correct 2 ms 204 KB Output is correct
7 Correct 2 ms 300 KB Output is correct
8 Correct 2 ms 204 KB Output is correct
9 Correct 2 ms 204 KB Output is correct
10 Correct 2 ms 204 KB Output is correct
11 Correct 12 ms 588 KB Output is correct
12 Correct 11 ms 588 KB Output is correct
13 Correct 15 ms 588 KB Output is correct
14 Correct 16 ms 744 KB Output is correct
15 Correct 633 ms 11220 KB Output is correct
16 Correct 622 ms 11176 KB Output is correct
17 Correct 632 ms 11224 KB Output is correct
18 Correct 607 ms 10836 KB Output is correct
19 Correct 608 ms 10944 KB Output is correct
20 Correct 473 ms 10924 KB Output is correct
21 Correct 471 ms 10944 KB Output is correct
22 Correct 472 ms 10916 KB Output is correct
23 Correct 603 ms 10928 KB Output is correct
24 Correct 613 ms 10936 KB Output is correct