Problem p02707 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
#ifdef __LOCAL
#define DBG(X) cout << #X << " = " << (X) << endl;
#define SAY(X) cout << (X) << endl;
#include <filesystem>
namespace fs = std::filesystem;
#else
#define DBG(X)
#define SAY(X)
#endif

using namespace std;

using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

int dx[] = {1, 0, -1, 0, 1, -1, 1, -1};
int dy[] = {0, 1, 0, -1, 1, 1, -1, -1};
const int INT_INF = (int)(2e9);
const ll LL_INF = (ll)(2e18);
static mt19937 _g(time(nullptr));

inline ll randint(ll a, ll b) {
  ll w = (_g() << 31LL) ^ _g();
  return a + w % (b - a + 1);
}
inline void fast_io() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
};
template <typename T, typename S>
inline ostream &operator<<(ostream &os, const pair<T, S> p) {
  cout << "[" << p.first << ";" << p.second << "]";
  return os;
}
template <typename T, typename S>
inline ostream &operator<<(ostream &os, const map<T, S> p) {
  for (auto el : p)
    cout << "[" << el.first << ";" << el.second << "]";
  return os;
}
template <typename T>
inline ostream &operator<<(ostream &os, const vector<T> &v) {
  for (auto el : v)
    cout << el << " ";
  return os;
}
template <typename T> inline vector<T> fetch_vec(int sz) {
  vector<T> ret(sz);
  for (auto &elem : ret)
    cin >> elem;
  return ret;
}

int N;
vector<int> Cnt;
void input() {
  fast_io();
#ifdef __LOCAL
  fs::path __p = __FILE__;
  fs::path __input, __output;
  __input = __output = __p.parent_path();
  __input += string("/input/") + string(__p.stem()) + string(".txt");
  __output += string("/output/") + string(__p.stem()) + string(".txt");
  freopen(__input.c_str(), "r", stdin);
  freopen(__output.c_str(), "w", stdout);
#endif
  cin >> N;
  Cnt.assign(N, 0);
  for (int i = 0; i < N; i++) {
    int a;
    cin >> a;
    Cnt[--a]++;
  }
}

int solve() {
  for (int i = 0; i < N; i++) {
    cout << Cnt[i] << endl;
  }

  return 0;
}

int main() {
  input();
  solve();
  return 0;
}


Fixed submission:
#include <bits/stdc++.h>
#ifdef __LOCAL
#define DBG(X) cout << #X << " = " << (X) << endl;
#define SAY(X) cout << (X) << endl;
#include <filesystem>
namespace fs = std::filesystem;
#else
#define DBG(X)
#define SAY(X)
#endif

using namespace std;

using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

int dx[] = {1, 0, -1, 0, 1, -1, 1, -1};
int dy[] = {0, 1, 0, -1, 1, 1, -1, -1};
const int INT_INF = (int)(2e9);
const ll LL_INF = (ll)(2e18);
static mt19937 _g(time(nullptr));

inline ll randint(ll a, ll b) {
  ll w = (_g() << 31LL) ^ _g();
  return a + w % (b - a + 1);
}
inline void fast_io() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
};
template <typename T, typename S>
inline ostream &operator<<(ostream &os, const pair<T, S> p) {
  cout << "[" << p.first << ";" << p.second << "]";
  return os;
}
template <typename T, typename S>
inline ostream &operator<<(ostream &os, const map<T, S> p) {
  for (auto el : p)
    cout << "[" << el.first << ";" << el.second << "]";
  return os;
}
template <typename T>
inline ostream &operator<<(ostream &os, const vector<T> &v) {
  for (auto el : v)
    cout << el << " ";
  return os;
}
template <typename T> inline vector<T> fetch_vec(int sz) {
  vector<T> ret(sz);
  for (auto &elem : ret)
    cin >> elem;
  return ret;
}

int N;
vector<int> Cnt;
void input() {
  fast_io();
#ifdef __LOCAL
  fs::path __p = __FILE__;
  fs::path __input, __output;
  __input = __output = __p.parent_path();
  __input += string("/input/") + string(__p.stem()) + string(".txt");
  __output += string("/output/") + string(__p.stem()) + string(".txt");
  freopen(__input.c_str(), "r", stdin);
  freopen(__output.c_str(), "w", stdout);
#endif
  cin >> N;
  Cnt.assign(N, 0);
  for (int i = 0; i < N - 1; i++) {
    int a;
    cin >> a;
    Cnt[--a]++;
  }
}

int solve() {
  for (int i = 0; i < N; i++) {
    cout << Cnt[i] << endl;
  }

  return 0;
}

int main() {
  input();
  solve();
  return 0;
}