Submission #530856

#	Time	Username	Problem	Language	Result	Execution time	Memory
530856		abc864197532	Intergalactic ship (IZhO19_xorsum)	C++17	17 / 100	2072 ms	2236 KiB

xorsum

#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp make_pair
#define eb emplace_back
#define pb push_back
#define pii pair<int,int>
#define X first
#define Y second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T i, U ...j) {
	cout << i << ' ', abc(j...);
}
template <typename T> void printv(T l, T r) {
	for (; l != r; ++l)
		cout << *l << " \n"[l + 1 == r];
}
#ifdef Doludu
#define test(x...) abc("[" + string(#x) + "]", x);
#define owo freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#else
#define test(x...) void(0)
#define owo ios::sync_with_stdio(false)
#endif
const int mod = 1e9 + 7, N = 200000;

int main () {
	owo;
	int n, q;
	cin >> n;
	vector <int> a(n);
	for (int i = 0; i < n; ++i)
		cin >> a[i];
	cin >> q;
	vector <array <int, 3>> updates(q);
	for (int i = 0; i < q; ++i) {
		cin >> updates[i][0] >> updates[i][1] >> updates[i][2];
		--updates[i][0];
	}
	lli ans = 0;
	for (int s = 0; s < 1 << q; ++s) {
		vector <int> b = a;
		for (int i = 0; i < q; ++i) if (s >> i & 1) {
			for (int j = updates[i][0]; j < updates[i][1]; ++j)
				b[j] ^= updates[i][2];
		}
		for (int i = 1; i < n; ++i)
			(b[i] += b[i - 1]) %= mod;
		lli pre_sq = 0, pre_sum = 0;
		for (int i = 0; i < n; ++i) {
			(pre_sq += b[i] * b[i]) %= mod;
			(pre_sum += b[i]) %= mod;
		}
		(ans += pre_sq * (n + 1) + mod - pre_sum * pre_sum % mod) %= mod;
	}
	cout << ans << endl;
}

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