#include <bits/stdc++.h>
using namespace std;
class input {
private:
char* t;
int sp;
const int sz = 10000;
char read()
{
if (sp == sz)
{
fread(t, 1, sz, stdin);
sp = 0;
return t[sp++];
}
else
return t[sp++];
}
public:
input()
{
sp = sz;
t = new char[sz]();
}
input& operator >> (int& n)
{
char c = read();
while (c == ' ' || c == '\n')
c = read();
n = 0;
int sng = 1;
if (c == '-')
sng = -1, c = read();
while (c != '\0' && isdigit(c))
n = n * 10 + (c - '0'), c = read();
n *= sng;
return *this;
}
input& operator >> (char& s)
{
char c = read();
while (c != '\0' && c == '\n')
c = read();
s = c;
return *this;
}
input& operator >> (long long& n)
{
char c = read();
while (c == ' ' || c == '\n')
c = read();
n = 0;
int sng = 1;
if (c == '-')
sng = -1, c = read();
while (c != '\0' && isdigit(c))
n = n * 10 + (c - '0'), c = read();
n *= sng;
return *this;
}
void getline(string& s)
{
char c = read();
s = "";
while (c != '\0' && c != '\n')
s += c, c = read();
}
input& operator >> (string& s)
{
char c;
c = read();
s = "";
while (c == '\n' || c == ' ')
c = read();
while (c != '\n' && c != '\0' && c != ' ')
s += c, c = read();
return *this;
}
input& operator >> (char* s)
{
char c;
c = read();
int i = 0;
while (c == '\n' || c == ' ')
c = read();
while (c != '\n' && c != '\0' && c != ' ')
s[i++] = c, c = read();
return *this;
}
};
class output {
private:
char* t;
int sp;
const int sz = 10000;
void write(char c)
{
if (sp == sz)
{
fwrite(t, 1, sz, stdout);
sp = 0;
t[sp++] = c;
}
else
t[sp++] = c;
}
public:
output()
{
sp = 0;
t = new char[sz]();
}
~output()
{
fwrite(t, 1, sp, stdout);
}
output& operator << (int n)
{
if (n < 0)
{
write('-');
n *= -1;
}
if (n <= 9)
write(char(n + '0'));
else
{
(*this) << (n / 10);
write(char(n % 10 + '0'));
}
return *this;
}
output& operator << (char c)
{
write(c);
return *this;
}
output& operator << (const char* s)
{
int i = 0;
while (s[i] != '\0')
write(s[i++]);
return *this;
}
output& operator << (long long n)
{
if (n < 0)
{
write('-');
n *= -1;
}
if (n < 10)
write(char(n + '0'));
else
{
(*this) << (n / 10);
write(char(n % 10 + '0'));
}
return *this;
}
output& operator << (string s)
{
for (auto i : s)
write(i);
return *this;
}
void precizion(double x, int nr)
{
int p = int(floor(x));
*this << p;
if (nr == 0)
return;
write('.');
for (int i = 1; i <= nr; i++)
{
x -= floor(x);
x *= 10;
write(int(x) + '0');
}
}
};
class Set {
private:
#define sub(p) (p == NULL ? 0 : p->nr)
#define hight(p) (p == NULL ? 0 : p->hight)
#define getBalanced(p) (p == NULL ? 0 : hight(p->left) - hight(p->right))
struct nod {
int val, hight, nr, fr;
nod* left, * right;
};
nod* root;
inline nod* New(int val)
{
nod* p = new nod;
p->val = val;
p->left = p->right = NULL;
p->nr = p->hight = 1;
p->fr = 1;
return p;
}
inline nod* to_right(nod* x)
{
nod* y = x->left;
nod* z = y->right;
y->right = x;
x->left = z;
x->hight = max(hight(x->left), hight(x->right)) + 1;
y->hight = max(hight(y->left), hight(y->right)) + 1;
x->nr = sub(x->left) + sub(x->right) + x->fr;
y->nr = sub(y->left) + sub(y->right) + y->fr;
return y;
}
inline nod* to_left(nod* x)
{
nod* y = x->right;
nod* z = y->left;
y->left = x;
x->right = z;
x->hight = max(hight(x->left), hight(x->right)) + 1;
y->hight = max(hight(y->left), hight(y->right)) + 1;
x->nr = sub(x->left) + sub(x->right) + x->fr;
y->nr = sub(y->left) + sub(y->right) + y->fr;
return y;
}
nod* add(nod* root, int val)
{
if (root == NULL)
return New(val);
if (root->val < val)
root->right = add(root->right, val);
else if (root->val > val)
root->left = add(root->left, val);
else
{
root->fr++;
root->nr++;
return root;
}
root->hight = max(hight(root->left), hight(root->right)) + 1;
root->nr = sub(root->left) + sub(root->right) + root->fr;
int b = getBalanced(root);
if (b > 1)
{
if (val < root->left->val)
return to_right(root);
else
{
root->left = to_left(root->left);
return to_right(root);
}
}
else if (b < -1)
{
if (val > root->right->val)
return to_left(root);
else
{
root->right = to_right(root->right);
return to_left(root);
}
}
return root;
}
int greaterThan(nod* p, int& val)
{
if (p == NULL)
return 0;
if (p->val < val)
return greaterThan(p->right, val);
return p->fr + greaterThan(p->left, val) + sub(p->right);
}
int lessThanPrv(nod* p, int& val)
{
if (p == NULL)
return 0;
if (p->val > val)
return lessThanPrv(p->left, val);
return p->fr + lessThanPrv(p->right, val) + sub(p->left);
}
int intervalPrv(nod* p, int& l, int& r)
{
if (p == NULL)
return 0;
if (p->val < l)
return intervalPrv(p->right, l, r);
else if (r < p->val)
return intervalPrv(p->left, l, r);
return p->fr + greaterThan(p->left, l) + lessThanPrv(p->right, r);
}
public:
Set()
{
root = NULL;
}
void clear()
{
root = NULL;
}
void insert(int val)
{
if (root == NULL)
{
root = new nod;
root->nr = root->hight = 1;
root->left = root->right = NULL;
root->val = val;
root->fr = 1;
return;
}
root = add(root, val);
}
int interval(int l, int r)
{
if (l > r)
return 0;
return intervalPrv(root, l, r);
}
int lessThan(int val)
{
return lessThanPrv(root, val);
}
int greaterThan(int val)
{
return greaterThan(root, val);
}
};
input fin;
output fout;
// (((1 << k) <= nr && nr < (1 << (k + 1))) || (nr >= (1 << k) + (1 << (k + 1))))
int v[1000001], x[1000001], n, POW[32];
int* vp, * xp, * p;
long long bit[30];
const int p2 = 8388608;
int t[p2 + 2], a[1000001], M[p2 + 2], w[1000001];
Set S;
void Sort(int l, int r)
{
if (l == r)
return;
int m = (l + r) >> 1;
Sort(l, m);
Sort(m + 1, r);
int i = l, j = m + 1, sz = 0;
while (i <= m && j <= r)
if (a[i] < a[j])
w[sz++] = a[i++];
else
w[sz++] = a[j++];
while (i <= m)
w[sz++] = a[i++];
while (j <= r)
w[sz++] = a[j++];
for (i = l, j = 0; i <= r; i++, j++)
a[i] = w[j];
}
void add(int poz)
{
for (int o = poz; o <= n; o += (o & -o))
t[o]++;
}
int get(int poz)
{
int s = 0;
for (int o = poz; o; o -= (o & -o))
s += t[o];
return s;
}
void reset()
{
p = (t + 1);
while (*p != -1)
*p = 0, p++;
}
int main()
{
t[p2 + 1] = -1;
for (int i = 0; i <= 30; i++)
POW[i] = (1 << i);
fin >> n;
for (int i = 1; i <= n; i++)
fin >> v[i];
for (int k = 0; k < 24; k++)
{
vp = v;
vp++;
xp = x;
xp++;
for (int i = 1; i <= n; i++)
{
if (*vp & 1)
*xp += POW[i];
*vp >>= 1;
a[i] = *xp;
vp++;
xp++;
add(1);
}
Sort(1, n);
}
for (int k = 24; k <= 29; k++)
{
vp = v;
vp++;
xp = x;
xp++;
for (int i = 1; i <= n; i++)
{
if (*vp & 1)
*xp += POW[k];
*vp >>= 1;
S.insert(*xp);
bit[k] += S.interval(POW[k] - *xp, POW[k + 1] - *xp - 1) + S.greaterThan(POW[k] + POW[k + 1] - *xp);
vp++;
xp++;
}
S.clear();
}
int res = 0;
for (int k = 0; k <= 29; k++)
if (bit[k] & 1)
res += POW[k];
fout << res;
return 0;
}
Compilation message
xorsum.cpp: In member function 'char input::read()':
xorsum.cpp:14:18: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
14 | fread(t, 1, sz, stdin);
| ~~~~~^~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
612 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
1654 ms |
20556 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
1654 ms |
20556 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
612 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
612 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
