Submission #498763

#	Time	Username	Problem	Language	Result	Execution time	Memory
498763		ahmedfouadnew	XOR Sum (info1cup17_xorsum)	C++17	11 / 100	269 ms	4512 KiB

xorsum

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
int a[5005];
signed main()
{

    int n;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        int x;
        cin>>x;
        a[x]++;
    }
    int ans=0;
    for(int i=1;i<=4000;i++)
    {
        for(int j=i;j<=4000;j++)
        {
            if(!a[i]||!a[j]) continue;
            if(i==j&&(a[i]*(a[j]+1)/2)%2==0) continue;
            if(i!=j&&((a[i]*a[j])%2==0)) continue;
            ans^=(i+j);

        }
    }
    cout<<ans<<endl;
}

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