#include <bits/stdc++.h>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define PB push_back
#define MP make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pil pair<int, ll>
#define pli pair<ll, int>
#define pdd pair<ld, ld>
#define ft first
#define sd second
using namespace std;
using namespace __gnu_cxx;
using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
template<class T>
using ordered_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
const int N = 1000100;
const int M = 100100;
const int BIG = int(5e6);
const int oo = 2e9;
const ll OO = 1e18;
const int md = 998244353;
const int PW = 30;
ll sum;
int a[N], ans = 0, n, mask, mn, mx, l1, r1, l2, r2, vc[N];
void calc(int &l, int &r){
while (l > 0 && vc[l - 1] >= mn)
l--;
while (r >= 0 && vc[r] > mx)
r--;
sum += r - l + 1;
}
int main() {
#ifdef _LOCAL
freopen("in.txt","r",stdin); //freopen("output.txt","w",stdout);
#else
// freopen("mining.in","r",stdin); freopen("mining.out","w",stdout);
ios_base::sync_with_stdio(0); cin.tie(0);
#endif
cin >> n;
for (int i = 0; i < n; i++)
cin >> a[i];
for (int bt = 0; bt < PW; bt++){
mask = (1 << (bt + 1)) - 1;
for (int i = 0; i < n; i++)
vc[i] = a[i] & mask);
sort(all(vc));
sum = 0;
l1 = n, r1 = n - 1, l2 = n, r2 = n - 1;
for (int cr : vc){
mn = (1 << bt) - cr;
mx = (1 << (bt + 1)) - 1 - cr;
calc(l1, r1);
if (cr >= mn && cr <= mx)
sum--;
mn += (1 << (bt + 1));
mx = (1 << (bt + 2)) - 1 - cr;
calc(l2, r2);
if (cr >= mn && cr <= mx)
sum--;
}
sum /= 2;
if (sum & 1)
ans += (1 << bt);
}
for (int i = 0; i < n; i++)
ans ^= (a[i] + a[i]);
cout << ans;
return 0;
}
Compilation message
xorsum.cpp: In function 'int main()':
xorsum.cpp:66:32: error: expected ';' before ')' token
vc[i] = a[i] & mask);
^
xorsum.cpp:11:18: error: request for member 'begin' in 'vc', which is of non-class type 'int [1000100]'
#define all(x) x.begin(),x.end()
^
xorsum.cpp:68:14: note: in expansion of macro 'all'
sort(all(vc));
^~~
xorsum.cpp:11:28: error: request for member 'end' in 'vc', which is of non-class type 'int [1000100]'
#define all(x) x.begin(),x.end()
^
xorsum.cpp:68:14: note: in expansion of macro 'all'
sort(all(vc));
^~~
