Submission #576049

#	Time	Username	Problem	Language	Result	Execution time	Memory
576049		I_am_balancing	XOR Sum (info1cup17_xorsum)	C++17	45 / 100	1677 ms	2152 KiB

xorsum

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using pl = pair<ll,ll>;
using tl = tuple<ll,ll,ll>;
using ld = long double;
#define all(x) (x).begin(),(x).end()
#define sz(x) ll((x).size())
#define pb emplace_back
#define F first
#define S second
const ll inf = (1ll<<60);
const ll N = 1e6 + 100;
const ll K = 3;
const ld PI = 3.141592653589793238462643383279;
//mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
int a[N];
void solve(){
    int n;
    cin >> n;
    int ans = 0;
    for(ll i = 1;i<=n;i++){
        cin >> a[i];
        for(ll j = 1;j<=i;j++){
            ans^=(a[i]+a[j]);
        }
    }
    cout << ans;
}


int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    ll t = 1;
    //cin >> t;
    //cout << fixed << setprecision(20);
    while(t--){
        solve();
    }
}

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