Submission #1114486

#	Time	Username	Problem	Language	Result	Execution time	Memory
1114486		stdfloat	Intergalactic ship (IZhO19_xorsum)	C++17	9 / 100	2059 ms	1616 KiB

xorsum

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

const int md = (int)1e9 + 7;

int main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);

	int n;
	cin >> n;

	vector<int> a(n);
	for (auto &i : a)
		cin >> i;

	int q;
	cin >> q;

	vector<int> l(q), r(q), x(q);
	for (int i = 0; i < q; i++) {
		cin >> l[i] >> r[i] >> x[i]; l[i]--; r[i]--;
	}

	int ans = 0;
	for (int mk = 0; mk < 1 << q; mk++) {
		vector<int> v = a;
		for (int i = 0; i < q; i++) {
			if ((mk >> i) & 1) {
				for (int j = l[i]; j <= r[i]; j++)
					v[j] ^= x[i];
			}
		}

		for (int i = 0; i < n; i++) {
			int sm = 0;
			for (int j = i; j < n; j++) {
				sm = (sm + v[j]) % md;

				ans = (ans + (ll)sm * sm % md) % md;
			}
		}
	}

	cout << ans;
}

• 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