oj.uz

Submission #1097290

# Submission time Handle Problem Language Result Execution time Memory
1097290 2024-10-06T16:49:09 Z vjudge1 XORanges (eJOI19_xoranges) C++14
100 / 100
 417 ms 13496 KB 
#include <bits/stdc++.h>

using namespace std;

struct Segtree {
    int n, d;
    vector<int> st;
    
    Segtree(const vector<int>& a, int c) {
        n = (int)a.size();
        st = vector<int>(4*n);
        d = c;
        build(1, 0, n-1, a);
    }

    void build(int p, int l, int r, const vector<int>& a) {
        if (l == r) {
            if (l%2 == d) st[p] = a[l];
            else st[p] = 0; 
        } else {
            int m = (l+r)/2;
            build(2*p, l, m, a);
            build(2*p+1, m+1, r, a);
            st[p] = st[2*p]^st[2*p+1];
        }
    } 

    void change(int p, int l, int r, int i, int x) {
        if (l == r) {
            if (l%2 == d) st[p] = x;
            else st[p] = 0;
        } else {
            int m = (l+r)/2;
            if (i <= m) change(2*p, l, m, i, x);
            else change(2*p+1, m+1, r, i, x);
            st[p] = st[2*p]^st[2*p+1];
        }
    }

    int Xor(int p, int l, int r, int i, int j) {
        if (i > j) return 0;
        if (i == l && j == r) return st[p];
        int m = (l+r)/2;
        return Xor(2*p, l, m, i, min(m, j))^Xor(2*p+1, m+1, r, max(i, m+1), j);
    }

    void change(int i, int x) { change(1, 0, n-1, i, x); }
    int Xor(int i, int j) { return Xor(1, 0, n-1, i, j); }
};

int main() {
    int n, q;
    cin >> n >> q;
    vector<int> a(n);
    for (int i = 0; i < n; ++i) cin >> a[i];
    Segtree St0(a, 0), St1(a, 1);

    while (q--) {
        int t; cin >> t;
        if (t == 1) {
            int p, x; cin >> p >> x;
            --p;
            if (p%2) St1.change(p, x);
            else St0.change(p, x);
        } else {
            int l, r; cin >> l >> r; --l; --r;
            if ((r-l+1)%2) {
                if (l%2) cout << St1.Xor(l, r) << endl;
                else cout << St0.Xor(l, r) << endl;
            } else cout << 0 << endl;
        }
    }

    return 0;
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #2
18.0 / 18.0

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

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 2 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 7 ms 604 KB Output is correct
12 Correct 7 ms 604 KB Output is correct
13 Correct 9 ms 740 KB Output is correct
14 Correct 9 ms 720 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 401 ms 13496 KB Output is correct
2 Correct 383 ms 13392 KB Output is correct
3 Correct 387 ms 13392 KB Output is correct
4 Correct 373 ms 13140 KB Output is correct
5 Correct 417 ms 13064 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 2 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 7 ms 604 KB Output is correct
12 Correct 7 ms 604 KB Output is correct
13 Correct 9 ms 740 KB Output is correct
14 Correct 9 ms 720 KB Output is correct
15 Correct 401 ms 13496 KB Output is correct
16 Correct 383 ms 13392 KB Output is correct
17 Correct 387 ms 13392 KB Output is correct
18 Correct 373 ms 13140 KB Output is correct
19 Correct 417 ms 13064 KB Output is correct
20 Correct 300 ms 13136 KB Output is correct
21 Correct 282 ms 13112 KB Output is correct
22 Correct 287 ms 13092 KB Output is correct
23 Correct 368 ms 13140 KB Output is correct
24 Correct 392 ms 13140 KB Output is correct