Problem p03379 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
#define FI first
#define SE second
#define EPS 1e-9
#define ALL(a) a.begin(), a.end()
#define SZ(a) int((a).size())
#define MS(s, n) memset(s, n, sizeof(s))
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FORE(i, a, b) for (int i = (a); i >= (b); i--)
#define FORALL(it, a)                                                          \
  for (__typeof((a).begin()) it = (a).begin(); it != (a).end(); it++)
#define WHATIS(x) cout << #x << " is " << x << endl;
#define ERROR(args...)                                                         \
  {                                                                            \
    string _s = #args;                                                         \
    replace(_s.begin(), _s.end(), ',', ' ');                                   \
    stringstream _ss(_s);                                                      \
    istream_iterator<string> _it(_ss);                                         \
    err(_it, args);                                                            \
  }
//__builtin_ffs(x) return 1 + index of least significant 1-bit of x
//__builtin_clz(x) return number of leading zeros of x
//__builtin_ctz(x) return number of trailing zeros of x

using namespace std;
using ll = long long;
using ld = double;
typedef pair<int, int> II;
typedef pair<II, ll> III;
typedef complex<ld> cd;
typedef vector<cd> vcd;

void err(istream_iterator<string> it) {}
template <typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
  cout << *it << " = " << a << endl;
  err(++it, args...);
}

const ll MODBASE = 1000000007LL;
const int MAXN = 100010;
const int MAXM = 100010;
const int MAXK = 510;
const int MAXQ = 200010;

int x[MAXN], b[MAXN], n, y[MAXN];

int main() {
  ios::sync_with_stdio(0);
  cin.tie(nullptr);
  cin >> n;
  FOR(i, 1, n) cin >> x[i];
  FOR(i, 1, n) y[i] = x[i];
  sort(y + 1, y + n + 1);
  FOR(i, 1, n)
  if (x[i] > y[n / 2])
    cout << y[n / 2] << "\n";
  else
    cout << y[n / 2 + 1] << "\n";
  return 0;
}

Fixed submission:
#include <bits/stdc++.h>
#define FI first
#define SE second
#define EPS 1e-9
#define ALL(a) a.begin(), a.end()
#define SZ(a) int((a).size())
#define MS(s, n) memset(s, n, sizeof(s))
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FORE(i, a, b) for (int i = (a); i >= (b); i--)
#define FORALL(it, a)                                                          \
  for (__typeof((a).begin()) it = (a).begin(); it != (a).end(); it++)
#define WHATIS(x) cout << #x << " is " << x << endl;
#define ERROR(args...)                                                         \
  {                                                                            \
    string _s = #args;                                                         \
    replace(_s.begin(), _s.end(), ',', ' ');                                   \
    stringstream _ss(_s);                                                      \
    istream_iterator<string> _it(_ss);                                         \
    err(_it, args);                                                            \
  }
//__builtin_ffs(x) return 1 + index of least significant 1-bit of x
//__builtin_clz(x) return number of leading zeros of x
//__builtin_ctz(x) return number of trailing zeros of x

using namespace std;
using ll = long long;
using ld = double;
typedef pair<int, int> II;
typedef pair<II, ll> III;
typedef complex<ld> cd;
typedef vector<cd> vcd;

void err(istream_iterator<string> it) {}
template <typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
  cout << *it << " = " << a << endl;
  err(++it, args...);
}

const ll MODBASE = 1000000007LL;
const int MAXN = 200010;
const int MAXM = 100010;
const int MAXK = 510;
const int MAXQ = 200010;

int x[MAXN], b[MAXN], n, y[MAXN];

int main() {
  ios::sync_with_stdio(0);
  cin.tie(nullptr);
  cin >> n;
  FOR(i, 1, n) cin >> x[i];
  FOR(i, 1, n) y[i] = x[i];
  sort(y + 1, y + n + 1);
  FOR(i, 1, n)
  if (x[i] > y[n / 2])
    cout << y[n / 2] << "\n";
  else
    cout << y[n / 2 + 1] << "\n";
  return 0;
}