Submission #992032

#	Time	Username	Problem	Language	Result	Execution time	Memory
992032		ramalzaher	XOR Sum (info1cup17_xorsum)	C++14	11 / 100	1625 ms	131072 KiB

xorsum

#include <bits/stdc++.h>
#define ll long long  
#define sz size()
#define pb push_back
#define all(x) x.begin() , x.end()
using namespace std;
int main()
{
	ll n; cin >> n ; ll a[n] ; 
	map<int,int> mp ;ll mx = -1 ;  
	for (int i = 0; i < n; i++)
	{
		cin >> a[i];  mp[a[i]] ++ ; 
		mx = max(mx , a[i] );  
	}
		ll ans = 0 ; map<pair<int,int> , int > mp1 ;
	for(int i = 0 ; i < mx+22 ; i ++ ){
		if(mp[i]==0)continue ; 
		 if((mp[i]*(mp[i]+1)/2)%2) {
            ans^=(i*2);
        }
        for(int j=i+1;j<=mx+22;++j) {
            if(mp[i]&&mp[j]&&(mp[i]*mp[j]%2==1)) {
                ans^=(i+j);
            }
	}}
	cout<<ans<<endl; 
   return 0;
}

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