Submission #1088208

#	Time	Username	Problem	Language	Result	Execution time	Memory
1088208		vahagng	XOR Sum (info1cup17_xorsum)	C++17	7 / 100	1626 ms	13072 KiB

xorsum

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(v) v.begin(),v.end()
#define endl '\n'

const int N = 1e6 + 10;

ll n, a[N], ans;

map<ll,ll>mp;

void solve(){
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        mp[a[i]]++;
    }
    for(auto i : mp){
        for(auto j : mp){
            if(j.first <= i.first) continue;
            if((j.second * i.second)&1){
                ans ^= (j.first + i.first);
            }
        }
        ans ^= (2*i.first);
    }
    cout << ans << endl;
}

int main(){
    int t = 1;
    // cin >> t;
    while(t--){
        solve();
    }
    return 0;
}

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