Problem p03160 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
#define ll long long int
#define fast_io                                                                \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL)
#define endl '\n'
#define pb push_back
#define mp make_pair
#define all(a) a.begin(), a.end()
#define max_pqueue priority_queue<long long>
#define min_pqueue                                                             \
  priority_queue<long long, vector<long long>, greater<long long>>
#define vi vector<int>
#define vii vector<pair<int, int>>
#define vl vector<long long>
#define vll vector<pair<long long, long long>>
#define FF first
#define SS second

//~ setbase - cout << setbase (16); cout << 100 << endl; Prints 64
//~ setfill -   cout << setfill ('x') << setw (5); cout << 77 << endl; prints
//xxx77 ~ setprecision - cout << setprecision (14) << f << endl; Prints x.xxxx
//~ cout.precision(x)  cout<<fixed<<val;  // prints x digits after decimal in
//val

#ifndef LOCAL_MACHINE
#define cerr                                                                   \
  if (false)                                                                   \
  cerr
#endif

using namespace std;

void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }

template <typename T, typename V> void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T> void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto i : x)
    cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V> void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v))
    cerr << ", ";
  _print(v...);
}
template <typename T> void _printA(T *t, long long sz) {
  cout << " { ";
  for (long long i = 0; i < sz; i++)
    cout << "[" << i << "] = " << t[i] << endl;
  cout << " } \n";
}
#ifdef LOCAL_MACHINE
#define debug(x...)                                                            \
  cerr << "[" << #x << "] = [";                                                \
  _print(x)
#define debugA(x, y)                                                           \
  cerr << "[" << #x << "] = ";                                                 \
  _printA(x, y)
#else
#define debug(x...)
#define debugA(x, y)
#endif

const ll _MOD = 998244353LL;

ll mod(ll a, ll m = _MOD) { return (a + m) % m; }

ll gcd(ll a, ll b) { return __gcd(a, b); }

ll gcd(ll a, ll b, ll &x, ll &y) {
  if (a == 0) {
    x = 0;
    y = 1;
    return b;
  }
  ll x1, y1;
  ll d = gcd(b % a, a, x1, y1);
  x = y1 - (b / a) * x1;
  y = x1;
  return d;
}

ll modinv(ll a, ll m = _MOD) {
  ll x, y;
  gcd(a, m, x, y);
  x = (x % m + m) % m;
  return x;
}

/* ------------------------------------------------------------------ */

ll h[(int)1e4 + 5];
ll dp[(int)1e4 + 5];
void solve() {
  ll n;
  cin >> n;
  for (int i = 0; i < n; i++)
    cin >> h[i];
  dp[0] = 0;
  dp[1] = abs(h[1] - h[0]);
  for (int i = 2; i < n; i++) {
    ll a = abs(h[i] - h[i - 1]) + dp[i - 1];
    ll b = abs(h[i] - h[i - 2]) + dp[i - 2];
    dp[i] = min(a, b);
  }

  cout << dp[n - 1] << endl;
}

int main() {
#ifdef LOCAL_MACHINE
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-result"
  freopen("in", "r", stdin);
#pragma GCC diagnostic pop
#endif

  fast_io;
  ll T;
  T = 1;
  //~ cin>>T;
  for (ll t = 0; t < T; t++) {
    solve();
  }
}


Fixed submission:
#include <bits/stdc++.h>
#define ll long long int
#define fast_io                                                                \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL)
#define endl '\n'
#define pb push_back
#define mp make_pair
#define all(a) a.begin(), a.end()
#define max_pqueue priority_queue<long long>
#define min_pqueue                                                             \
  priority_queue<long long, vector<long long>, greater<long long>>
#define vi vector<int>
#define vii vector<pair<int, int>>
#define vl vector<long long>
#define vll vector<pair<long long, long long>>
#define FF first
#define SS second

//~ setbase - cout << setbase (16); cout << 100 << endl; Prints 64
//~ setfill -   cout << setfill ('x') << setw (5); cout << 77 << endl; prints
//xxx77 ~ setprecision - cout << setprecision (14) << f << endl; Prints x.xxxx
//~ cout.precision(x)  cout<<fixed<<val;  // prints x digits after decimal in
//val

#ifndef LOCAL_MACHINE
#define cerr                                                                   \
  if (false)                                                                   \
  cerr
#endif

using namespace std;

void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }

template <typename T, typename V> void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T> void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto i : x)
    cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V> void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v))
    cerr << ", ";
  _print(v...);
}
template <typename T> void _printA(T *t, long long sz) {
  cout << " { ";
  for (long long i = 0; i < sz; i++)
    cout << "[" << i << "] = " << t[i] << endl;
  cout << " } \n";
}
#ifdef LOCAL_MACHINE
#define debug(x...)                                                            \
  cerr << "[" << #x << "] = [";                                                \
  _print(x)
#define debugA(x, y)                                                           \
  cerr << "[" << #x << "] = ";                                                 \
  _printA(x, y)
#else
#define debug(x...)
#define debugA(x, y)
#endif

const ll _MOD = 998244353LL;

ll mod(ll a, ll m = _MOD) { return (a + m) % m; }

ll gcd(ll a, ll b) { return __gcd(a, b); }

ll gcd(ll a, ll b, ll &x, ll &y) {
  if (a == 0) {
    x = 0;
    y = 1;
    return b;
  }
  ll x1, y1;
  ll d = gcd(b % a, a, x1, y1);
  x = y1 - (b / a) * x1;
  y = x1;
  return d;
}

ll modinv(ll a, ll m = _MOD) {
  ll x, y;
  gcd(a, m, x, y);
  x = (x % m + m) % m;
  return x;
}

/* ------------------------------------------------------------------ */

ll h[(int)1e5 + 5];
ll dp[(int)1e5 + 5];
void solve() {
  ll n;
  cin >> n;
  for (int i = 0; i < n; i++)
    cin >> h[i];
  dp[0] = 0;
  dp[1] = abs(h[1] - h[0]);
  for (int i = 2; i < n; i++) {
    ll a = abs(h[i] - h[i - 1]) + dp[i - 1];
    ll b = abs(h[i] - h[i - 2]) + dp[i - 2];
    dp[i] = min(a, b);
  }

  cout << dp[n - 1] << endl;
}

int main() {
#ifdef LOCAL_MACHINE
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-result"
  freopen("in", "r", stdin);
#pragma GCC diagnostic pop
#endif

  fast_io;
  ll T;
  T = 1;
  //~ cin>>T;
  for (ll t = 0; t < T; t++) {
    solve();
  }
}