Problem p02698 (C++) — buggy submission, verdict: Runtime Error

#include <bits/stdc++.h>
using namespace std;

#define REP(i, m, n) for (int i = (m); i < (int)(n); i++)
#define RREP(i, m, n) for (int i = (int)(n - 1); i >= m; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define fi first
#define se second
#define debug(...)                                                             \\
  {                                                                            \\
    cerr << "[L" << __LINE__ << "] ";                                          \\
    _debug(__VA_ARGS__);                                                       \\
  }

template <typename T> string join(const vector<T> &v, string del = ", ") {
  stringstream s;
  for (auto x : v)
    s << del << x;
  return s.str().substr(del.size());
}
template <typename T> ostream &operator<<(ostream &o, const vector<T> &v) {
  if (v.size())
    o << "[" << join(v) << "]";
  return o;
}
template <typename T>
ostream &operator<<(ostream &o, const vector<vector<T>> &vv) {
  int l = vv.size();
  if (l) {
    o << endl;
    rep(i, l) o << (i == 0 ? "[ " : ",\\n  ") << vv[i]
                << (i == l - 1 ? " ]" : "");
  }
  return o;
}
inline void _debug() { cerr << endl; }
template <class First, class... Rest>
void _debug(const First &first, const Rest &...rest) {
  cerr << first << " ";
  _debug(rest...);
}

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;

const double PI = (1 * acos(0.0));
const double EPS = 1e-9;
const int INF = 0x3f3f3f3f;
const ll INFL = 0x3f3f3f3f3f3f3f3fLL;
const ll mod = 1e9 + 7;

inline void finput(string filename) { freopen(filename.c_str(), "r", stdin); }

vi g[200010];
vl a, l;
vl dp;

void dfs(int v, int p = -1) {
  int pos = lower_bound(all(dp), a[v]) - dp.begin();
  ll tmp = dp[pos];
  dp[pos] = a[v];
  l[v] = lower_bound(all(dp), INFL) - dp.begin();
  for (auto u : g[v]) {
    if (u == p)
      continue;
    dfs(u, v);
  }
  dp[pos] = tmp;
}

int main() {
  ios_base::sync_with_stdio(0);
  // finput("./input");
  int n;
  cin >> n;
  a = vl(n);
  l = vl(n, 0);
  rep(i, n) cin >> a[i];
  rep(i, n - 1) {
    int u, v;
    cin >> u >> v;
    u--;
    v--;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  dp = vl(n + 1, INFL);
  dfs(0);
  rep(i, n) cout << l[i] << endl;
  return 0;
}

Error: 0

Fixed submission:

#include <bits/stdc++.h>
using namespace std;

#define REP(i, m, n) for (int i = (m); i < (int)(n); i++)
#define RREP(i, m, n) for (int i = (int)(n - 1); i >= m; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define fi first
#define se second
#define debug(...)                                                             \\
  {                                                                            \\
    cerr << "[L" << __LINE__ << "] ";                                          \\
    _debug(__VA_ARGS__);                                                       \\
  }

template <typename T> string join(const vector<T> &v, string del = ", ") {
  stringstream s;
  for (auto x : v)
    s << del << x;
  return s.str().substr(del.size());
}
template <typename T> ostream &operator<<(ostream &o, const vector<T> &v) {
  if (v.size())
    o << "[" << join(v) << "]";
  return o;
}
template <typename T>
ostream &operator<<(ostream &o, const vector<vector<T>> &vv) {
  int l = vv.size();
  if (l) {
    o << endl;
    rep(i, l) o << (i == 0 ? "[ " : ",\\n  ") << vv[i]
                << (i == l - 1 ? " ]" : "");
  }
  return o;
}
inline void _debug() { cerr << endl; }
template <class First, class... Rest>
void _debug(const First &first, const Rest &...rest) {
  cerr << first << " ";
  _debug(rest...);
}

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;

const double PI = (1 * acos(0.0));
const double EPS = 1e-9;
const int INF = 0x3f3f3f3f;
const ll INFL = 0x3f3f3f3f3f3f3f3fLL;
const ll mod = 1e9 + 7;

inline void finput(string filename) { freopen(filename.c_str(), "r", stdin); }

vi g[100010];
vi a, l;
vi dp;

void dfs(int v, int p = -1) {
  int pos = lower_bound(all(dp), a[v] + 1) - dp.begin();
  int tmp = dp[pos];
  dp[pos] = a[v];
  l[v] = lower_bound(all(dp), INF) - dp.begin();
  for (auto u : g[v]) {
    if (u == p)
      continue;
    dfs(u, v);
  }
  dp[pos] = tmp;
}

int main() {
  ios_base::sync_with_stdio(0);
  // finput("./input");
  int n;
  cin >> n;
  a = vi(n + 10);
  l = vi(n + 10, 0);
  rep(i, n) cin >> a[i];
  rep(i, n - 1) {
    int u, v;
    cin >> u >> v;
    u--;
    v--;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  dp = vi(n + 10, INF);
  dfs(0);
  rep(i, n) cout << l[i] << endl;
  return 0;
}