Submission #520106

#	Time	Username	Problem	Language	Result	Execution time	Memory
520106		shmad	Intergalactic ship (IZhO19_xorsum)	C++17	9 / 100	2073 ms	3388 KiB

xorsum

#pragma GCC optimize("O3", "unroll-loops") // "Ofast"
#pragma GCC target("avx2", "bmi", "bmi2", "lzcnt", "popcnt") 

#include <bits/stdc++.h>

#define int long long
#define vt vector
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define ff first
#define ss second
#define dbg(x) cerr << #x << " = " << x << '\n'

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vvi = vt< vt<int> >;

const int N = 1e6 + 5, mod = 1e9 + 7, inf = 1e18 + 7, B = 500, LIM = (1ll << 60);
const double eps = 1e-6;

int n, q, l[N], r[N], x[N];

bool bit (int x, int i) {
	return (x >> i & 1);
}

int add (int a, int b) {
	a = (a + b) % mod;
	return a;
}

int del (int a, int b) {
	a = (a - b + mod) % mod;
	return a;
}

int mul (int a, int b) {
	a = (a % mod) * (b % mod) % mod;
	return a;
}

void solve () {
	cin >> n;
	int a[n + 1];
	for (int i = 1; i <= n; i++) cin >> a[i];
	cin >> q;
	for (int i = 0; i < q; i++) cin >> l[i] >> r[i] >> x[i];
	int ans = 0;
	for (int mask = 0; mask < (1 << q); mask++) {
		vt<int> xr(n + 2, 0), p(n + 1, 0);	
		for (int i = 0; i < q; i++) {
			if (bit(mask, i)) xr[l[i]] ^= x[i], xr[r[i] + 1] ^= x[i];
		}
		for (int i = 1; i <= n; i++) xr[i] ^= xr[i - 1];
		for (int i = 1; i <= n; i++) p[i] = p[i - 1] + (a[i] ^ xr[i]);
		for (int i = 1; i <= n; i++) {
			for (int j = i; j <= n; j++) ans = add(ans, mul(p[j] - p[i - 1], p[j] - p[i - 1]));
		}
	}
	cout << ans;
	cout << '\n';
}

bool testcases = 0;
                  
signed main() {
#ifdef ONLINE_JUDGE
	freopen(".in", "r", stdin);
	freopen(".out", "w", stdout);
#endif
    cin.tie(0) -> sync_with_stdio(0);
    int test = 1;
    if (testcases) cin >> test;
    for (int cs = 1; cs <= test; cs++) {
        solve();
    }
}

• 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