Submission #1138785

#	Time	Username	Problem	Language	Result	Execution time	Memory
1138785		AHOKA	Intergalactic ship (IZhO19_xorsum)	C++20	4 / 100	2095 ms	328 KiB

xorsum

#pragma GCC optimize("O3") 

#include <bits/stdc++.h>

using namespace std;
 
#define threesum cin.tie(NULL); cout.tie(NULL); ios_base::sync_with_stdio(false)
#define all(a) a.begin(), a.end()
#define F first
#define S second
#define int long long
#define double long double
#define pii pair<int, int>
#define ppp pair<int, pii>
#define dout cout << fixed << setprecision(15)
#define mid ((l + r) / 2)
#define lc (2 * id)
#define rc (lc + 1)

const int maxn = 1e6 + 10, maxm = 3e1 + 10, oo = 1e18 + 10, lg = 8, sq = 350, mod = 1e9 + 7;

int n, m, a[maxm], b[maxm], px[maxm];

vector<ppp> q;

signed main()
{
	threesum;
    cin >> n;
    for (int i = 1; i <= n;i++)
        cin >> a[i];

    cin >> m;
    for (int i = 1; i <= m;i++){
        int l, r, x;
        cin >> l >> r >> x;
        q.push_back({x, {l, r}});
    }

    int ans = 0;

    for (int mask = 0; mask < (1ll << m); mask++){

        for (int i = 0; i < m; i++)
            if(mask & (1ll << i)){
                px[q[i].S.F] ^= q[i].F;
                px[q[i].S.S + 1] ^= q[i].F;
            }

        for (int i = 1; i <= n; i++){
            px[i] ^= px[i - 1];
            b[i] = a[i] ^ px[i];
        }

        int res = 0;

        for (int i = 1; i <= n; i++){
            int s = 0;
            for (int j = i; j <= n; j++){
                (s += b[j]) %= mod;
                (res += (s * s) % mod) %= mod;
            }
        }

        (ans += res) %= mod;

        for (int i = 1; i <= n; i++)
            px[i] = 0;
    }

    cout << ans;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 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