Problem p02971 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
using namespace std;
#define FOR(i, o, n) for (long long i = o; i < n; i++)
#define oneforall                                                              \
  ios::sync_with_stdio(false);                                                 \
  cin.tie(0);
#define all(v) (v).begin(), (v).end()
#define ini(...)                                                               \
  int __VA_ARGS__;                                                             \
  in(__VA_ARGS__)
#define inl(...)                                                               \
  long long __VA_ARGS__;                                                       \
  in(__VA_ARGS__)
#define ins(...)                                                               \
  string __VA_ARGS__;                                                          \
  in(__VA_ARGS__)
const long long INF = 1e18;
void in() {}
template <typename T, class... U> void in(T &t, U &...u) {
  cin >> t;
  in(u...);
}
void out() { cout << "\n"; }
template <typename T, class... U> void out(const T &t, const U &...u) {
  cout << t;
  if (sizeof...(u))
    cout << " ";
  out(u...);
}
typedef vector<int> vi;
typedef vector<long long> vl;
typedef long long ll;
typedef vector<pair<long, long>> vpll;
typedef vector<pair<int, int>> vpii;
int main() {
  oneforall oneforall oneforall oneforall oneforall oneforall oneforall
      oneforall oneforall oneforall oneforall oneforall oneforall oneforall ini(
          n);
  int a[10000];
  int tmp1 = 0;
  int tmp_ = 0;
  FOR(i, 0, n) { in(a[i]); }
  auto x_ = max_element(a, a + n);
  int pos = x_ - a;
  int tmp = a[pos];
  a[pos] = 0;
  auto x = max_element(a, a + n);
  a[pos] = tmp;
  FOR(i, 0, n) {
    if (a[i] == *x_) {
      out(*x);
    } else {
      out(*x_);
    }
  }
  return 0;
}

Fixed submission:
#include <bits/stdc++.h>
using namespace std;
#define FOR(i, o, n) for (long long i = o; i < n; i++)
#define oneforall                                                              \
  ios::sync_with_stdio(false);                                                 \
  cin.tie(0);
#define all(v) (v).begin(), (v).end()
#define ini(...)                                                               \
  int __VA_ARGS__;                                                             \
  in(__VA_ARGS__)
#define inl(...)                                                               \
  long long __VA_ARGS__;                                                       \
  in(__VA_ARGS__)
#define ins(...)                                                               \
  string __VA_ARGS__;                                                          \
  in(__VA_ARGS__)
const long long INF = 1e18;
void in() {}
template <typename T, class... U> void in(T &t, U &...u) {
  cin >> t;
  in(u...);
}
void out() { cout << "\n"; }
template <typename T, class... U> void out(const T &t, const U &...u) {
  cout << t;
  if (sizeof...(u))
    cout << " ";
  out(u...);
}
typedef vector<int> vi;
typedef vector<long long> vl;
typedef long long ll;
typedef vector<pair<long, long>> vpll;
typedef vector<pair<int, int>> vpii;
int main() {
  oneforall oneforall oneforall oneforall oneforall oneforall oneforall
      oneforall oneforall oneforall oneforall oneforall oneforall oneforall ini(
          n);
  int a[10000010];
  int tmp1 = 0;
  int tmp_ = 0;
  FOR(i, 0, n) { in(a[i]); }
  auto x_ = max_element(a, a + n);
  int pos = x_ - a;
  int tmp = a[pos];
  a[pos] = 0;
  auto x = max_element(a, a + n);
  a[pos] = tmp;
  FOR(i, 0, n) {
    if (a[i] == *x_) {
      out(*x);
    } else {
      out(*x_);
    }
  }
  return 0;
}