Submission #330779

#	Time	Username	Problem	Language	Result	Execution time	Memory
330779		vitkishloh228	Intergalactic ship (IZhO19_xorsum)	C++14	9 / 100	2068 ms	6924 KiB

xorsum

#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
#define int long long
const int inf = 1e9 + 7;
int32_t main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int& i : a) cin >> i;
    int q;
    cin >> q;
    vector<vector<int>> vals;
    vector<vector<int>> query(n);
    for (int i = 0; i < q; ++i) {
        int l, r, x;
        cin >> l >> r >> x;
        --l, r--;
        vals.push_back({ l,r,x });
        for (int j = l; j <= r; ++j) {
            query[j].push_back(x);
        }
    }
    int ans = 0;
    if (q <= 20) {
        for (int mask = 0; mask < (1 << q); ++mask) {
            vector<int> open(n + 1), close(n + 1);
            for (int i = 0; i < q; ++i) {
                if ((mask & (1 << i))) {
                    open[vals[i][0]] ^= vals[i][2];
                    close[vals[i][1] + 1] ^= vals[i][2];
                }
            }
            vector<int> pr(n + 1);
            int cur = 0;
            for (int i = 0; i < n; ++i) {
                cur ^= open[i];
                int R = a[i] ^ cur;
                pr[i + 1] = pr[i] + R;
                pr[i + 1] %= inf;
                cur ^= close[i + 1];
            }
            for (int i = 0; i < n; ++i) {
                for (int j = i; j < n; ++j) {
                    int sum = pr[j + 1] - pr[i];
                    if (sum < 0) sum += inf;
                    sum = (sum * sum) % inf;
                    ans += sum;
                    ans %= inf;
                }
            }
        }
        cout << ans;
        return 0;
    }
}

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 0 / 6
• Subtask 4: 0 / 9
• Subtask 5: 0 / 8
• Subtask 6: 0 / 11
• Subtask 7: 0 / 19
• Subtask 8: 0 / 30
• Subtask 9: 0 / 8