Submission #992940

#	Time	Username	Problem	Language	Result	Execution time	Memory
992940		NValchanov	Intergalactic ship (IZhO19_xorsum)	C++17	17 / 100	2058 ms	5164 KiB

xorsum

#include <bits/stdc++.h>

#define endl '\n'

using namespace std;

typedef long long ll;

const ll MAXN = 1e3 + 10;
const ll MOD = 1e9 + 7;
const ll MAXLOG = 10;

struct upd
{
    ll left, right;
    ll val;

    upd()
    {
        left = right = 1;
        val = 0;
    }

    upd(ll _left, ll _right, ll _val)
    {
        left = _left;
        right = _right;
        val = _val;
    }
};

ll n, q;
ll a[MAXN];
ll cur[MAXN];
vector < upd > updates;

ll ans = 0;

void read()
{
    cin >> n;
    for(ll i = 0; i < n; i++)
    {
        cin >> a[i];
    }
    cin >> q;
    for(ll i = 0; i < q; i++)
    {
        ll left, right;
        ll x;

        cin >> left >> right >> x;

        upd u = upd(left - 1, right - 1, x);

        updates.push_back(u);
    }
}

ll calc()
{
    ll qni = 0;
    ll sum = 0;
    ll sumsum = 0;

    for(ll i = 0; i < n; i++)
    {
        sum = (sum + cur[i]) % MOD;
        sumsum = (sumsum + sum) % MOD;
        qni = (qni + (sum * sum) % MOD) % MOD;
    }

    return (( qni * (n + 1) ) % MOD - (sumsum * sumsum) % MOD + MOD) % MOD;
}

void solve()
{
    for(ll mask = 0; mask < (1 << q); mask++)
    {
        for(ll i = 0; i < n; i++)
        {
            cur[i] = a[i];
        }

        for(ll j = 0; j < q; j++)
        {
            ll left = updates[j].left;
            ll right = updates[j].right;
            ll val = updates[j].val;

            if(mask & (1 << j))
            {
                for(ll i = left; i <= right; i++)
                {
                    cur[i] ^= val;
                }
            }
        }

        ans = (ans + calc()) % MOD;
    }

    cout << ans << endl;
}

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

    read();
    solve();

    return 0;
}

• 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