Submission #679441

#	Time	Username	Problem	Language	Result	Execution time	Memory
679441		grandmast3r	Intergalactic ship (IZhO19_xorsum)	C++17	9 / 100	2079 ms	6600 KiB

xorsum

#include <bits/stdc++.h>

#define ll long long
#define ld long double
#define vi vector<int>
#define pii pair<int, int>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

using namespace std;

const int MOD = 1e9 + 7;

int add(int a, int b){
    a += b;
    if (a >= MOD){
        a -= MOD;
    }
    return a;
}

int sub(int a, int b){
    a -= b;
    if (a < 0){
        a += MOD;
    }
    return a;
}

int mul(int a, int b){
    return (a * 1ll * b) % MOD;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    #ifdef ON_PC
        freopen("input.txt", "r", stdin);
    #endif
    // freopen("output.txt", "w", stdout);
    int T = 1;
    // cin >> T;
    while (T--){
        int n;
        cin >> n;
        vector<int> a(n + 1);
        for (int i = 1; i <= n; i++){
            cin >> a[i];
        }
        int q;
        cin >> q;
        vector<vector<int>> req(q);
        for (int id = 0; id < q; id++){
            req[id].resize(3);
            for (int i = 0; i < 3; i++){
                cin >> req[id][i];
            }
        }
        int res = 0;
        for (int i = 1; i <= n; i++){
            for (int mask = 0; mask < (1 << q); mask++){
                int x = a[i];
                for (int j = 0; j < q; j++){
                    if (mask & (1 << j)){
                        if (req[j][0] <= i && i <= req[j][1]){
                            x ^= req[j][2];
                        }
                    }
                }
                res = add(res, mul(mul(x, x), mul(i, n - i + 1)));
            }
        }
        for (int i = 1; i <= n; i++){
            for (int j = i + 1; j <= n; j++){
                for (int mask = 0; mask < (1 << q); mask++){
                    int x = a[i];
                    int y = a[j];
                    for (int k = 0; k < q; k++){
                        if (mask & (1 << k)){
                            if (req[k][0] <= i && i <= req[k][1]){
                                x ^= req[k][2];
                            }
                            if (req[k][0] <= j && j <= req[k][1]){
                                y ^= req[k][2];
                            }
                        }
                    }
                    int segcnt = mul(i, n - j + 1);
                    res = add(res, mul(mul(2, segcnt), mul(x, y)));
                }
            }
        }
        cout << res << "\n";
    }
    return 0;
}

• 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