Submission #1126772

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126772		koukirocks	Intergalactic ship (IZhO19_xorsum)	C++20	9 / 100	2095 ms	2628 KiB

xorsum

#include<bits/stdc++.h>
#define speed ios_base::sync_with_stdio(0);cin.tie(0)
#define F first
#define S second

using namespace std;
template<typename T>
using vvector = vector<vector<T>>;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const ll INF=0x3f3f3f3f;
const ll P=1e9+7;

int main() {
    speed;
    int n;
    cin>>n;
    vector<ll> a(n+1);
    for (int i=1;i<=n;i++) {
        cin>>a[i];
    }
    int q;
    cin>>q;
    vector<pair<pll,ll>> Q(q+1);
    for (int i=0;i<q;i++) {
        cin>>Q[i].F.F>>Q[i].F.S>>Q[i].S;
    }
    ll ans=0;
    for (int s=0;s<(1<<q);s++) {
        for (int i=0;i<q;i++) {
            if (s&(1<<i)) {
                for (int j=Q[i].F.F;j<=Q[i].F.S;j++) a[j]^=Q[i].S;
            }
        }
        vector<ll> pre(n+1);
        for (int i=1;i<=n;i++) pre[i]=(pre[i-1]+a[i])%P;
        ll now=0;
        for (int i=1;i<=n;i++) {
            for (int j=i;j<=n;j++) {
                now+=(pre[j]-pre[i-1]+P)%P*(pre[j]-pre[i-1]+P)%P;
                now%=P;
            }
        }
        ans+=now;
        ans%=P;
        for (int i=0;i<q;i++) {
            if (s&(1<<i)) {
                for (int j=Q[i].F.F;j<=Q[i].F.S;j++) a[j]^=Q[i].S;
            }
        }
    }
    cout<<ans<<"\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