#include<bits/stdc++.h>
#define ll long long
#define task " "
using namespace std;
const ll N = 1e6 + 5;
const ll mod = 1e9 + 7;
#define bit(x,y) ((x >> y) & 1)
ll a[N],b[N];
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
ll n;
cin >> n;
pair<ll,ll> tmp[n + 5],ntmp[n + 5];
ll i,j;
for(i = 1;i <= n;i++) cin >> a[i];
ll ans = 0;
for(ll id = 0;id <= 30;id++)
{
if(id == 0)
{
for(i = 1;i <= n;i++) tmp[i] = {(a[i] % (1LL << (id + 1))),i};
sort(tmp + 1,tmp + 1 + n);
}else
{
ll sus = 1;
for(i = 1;i <= n;i++)
{
if(!bit(a[tmp[i].second],id))
{
ntmp[sus++] = tmp[i];
}
}
for(i = 1;i <= n;i++)
{
if(bit(a[tmp[i].second],id))
{
ntmp[sus++] = {tmp[i].first ^ (1LL << id),tmp[i].second};
}
}
}
for(i = 1;i <= n;i++) b[i] = tmp[i].first;
ll cnt = 0;
ll l = n + 1,r = 0,s = n + 1;
ll t1 = (1LL << id),t2 = (1LL << (id + 1));
for(i = n;i >= 1;i--)
{
if(b[1] + b[i] >= t1) l = i;
else break;
}
for(i = 1;i <= n;i++)
{
if(b[1] + b[i] < t2) r = i;
else break;
}
for(i = n;i >= 1;i--)
{
if(t1 + t2 - b[1] <= b[i]) s = i;
else break;
}
cnt += max(0LL,r - l + 1) + (n - s + 1);
for(i = 2;i <= n;i++)
{
while(l - 1 >= 1 && b[i] + b[l - 1] >= t1) l--;
while(b[i] + b[r] >= t2) r--;
while(s >= 1 && t1 + t2 - b[i] <= b[s - 1]) s--;
cnt += max(0LL,r - max(l,i) + 1) + (n - max(i,s) + 1);
}
if(cnt % 2 == 1) ans = ans ^ (1 << id);
}
cout << ans;
}
Compilation message
xorsum.cpp: In function 'int main()':
xorsum.cpp:17:10: warning: unused variable 'j' [-Wunused-variable]
17 | ll i,j;
| ^
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
2 ms |
2652 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
417 ms |
47188 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
417 ms |
47188 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
2 ms |
2652 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
2 ms |
2652 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |