Submission #931070

#	Time	Username	Problem	Language	Result	Execution time	Memory
931070		hugsfromadicto	XOR Sum (info1cup17_xorsum)	C++14	45 / 100	1629 ms	2172 KiB

xorsum

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int mxN = 2e5+5;
int a[mxN];
void _()
{
   int n;
   cin >> n;
   int res = 0;
   for(int i = 0; i < n; ++i)
   {
       cin >> a[i];
       for(int j = 0; j <= i; ++j)
       {
           res ^= (a[i] + a[j]);
       }
   }
   cout << res;
}

main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);

  int tc = 1;
  //cin>>tc;
  while(tc--)
  {
      _();
  }

}

Compilation message (stderr)

xorsum.cpp:23:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   23 | main()
      | ^~~~

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