Submission #1319616

#	Time	Username	Problem	Language	Result	Execution time	Memory
1319616		Choco	XOR Sum (info1cup17_xorsum)	C++20	45 / 100	1695 ms	8248 KiB

xorsum

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")
#define ll long long
#define fori(i,j,k) for(ll i=j; i<=k;i++)
#define study ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define pb push_back
#define all(s) s.begin(),s.end()
#define ins insert
#define ss second
#define ff first
const ll sz=1e3+10;
ll INF=1e12;
ll mod=1e9+7;
void work(){
    ll n;
    cin>>n;
    vector<ll>v(n+10,0);
    fori(i,1,n)
    cin>>v[i];
    ll ans=0;
    fori(i,1,n){
        fori(j,i,n){
            ans^=(v[i]+v[j]);
        }
    }
    cout<<ans;
}
int main()
{
    // #ifndef LOCAL
    // freopen("maxcross.in","r",stdin);
    // freopen("maxcross.out","w",stdout);
    // #endif
    study;
    ll t=1;
    //cin>>t;
    fori(i,1,t)
    work();
}
/*
abca
acba
aca
aba
aa
abbacca
accabba
*/

• Subtask 1: 7 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 38 / 38
• Subtask 5: 0 / 23