#include <bits/stdc++.h>
// author : aykhn
using namespace std;
typedef long long ll;
#define pb push_back
#define ins insert
#define mpr make_pair
#define all(v) v.begin(), v.end()
#define bpc __builtin_popcountll
#define pii pair<ll, ll>
#define pll pair<ll, ll>
#define fi first
#define se second
#define int ll
#define infll 0x3F3F3F3F3F3F3F3F
#define inf 0x3F3F3F3F
const int MXN = 1e5 + 5;
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(nullptr);
int n;
cin >> n;
int a[n];
pii b[n];
for (int i = 0; i < n; i++) cin >> a[i], b[i] = mpr(0LL, i);
int res = 0;
for (int j = 0; j < 30; j++)
{
pii c[n];
int l = 0;
int r = n - 1;
for (int i = n - 1; i >= 0; i--) if (a[b[i].se] >> j & 1) c[r--] = {b[i].fi | (1 << j), b[i].se};
for (int i = 0; i < n; i++) if (!(a[b[i].se] >> j & 1)) c[l++] = b[i];
for (int i = 0; i < n; i++) b[i] = c[i];
int cnt = 0;
int i1, i2, i3, i4;
i1 = i2 = i3 = i4 = 0;
for (int i = n - 1; i >= 0; i--)
{
while (i1 < n && b[i1].fi < (1 << j) - b[i].fi) i1++;
while (i2 < n && b[i2].fi < (1 << (j + 1)) - b[i].fi) i2++;
while (i3 < n && b[i3].fi < ((1 << (j + 1)) | (1 << j)) - b[i].fi) i3++;
while (i4 < n && b[i4].fi < (1 << (j + 2)) - b[i].fi) i4++;
if (max(i1, i + 1) < i2) cnt += i2 - max(i1, i + 1);
if (max(i3, i + 1) < i4) cnt += i4 - max(i3, i + 1);
}
if (cnt & 1) res |= (1 << j);
}
cout << res << '\n';
}
// ignore (i + 1 -> 23];
// a[i] &= (1 << (i + 1)) - 1;
// (1 << i) <= a[i] + a[j] < (1 << (i + 1));
// (1 << (i + 1)) | (1 << i) <= a[i] + a[j] < (1 << (i + 2))
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
4 ms |
604 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
767 ms |
39564 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
767 ms |
39564 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
4 ms |
604 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
4 ms |
604 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |