Problem p03160 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
using namespace std;

/*###   FAST-IO  ###*/

#define IOS                                                                    \
  ios::sync_with_stdio(0);                                                     \
  cin.tie(0);                                                                  \
  cout.tie(0);

/*###   DEBUGGGGGGG   ###*/

#define trace1(x) cerr << #x << ": " << x << endl
#define trace2(x, y) cerr << #x << ": " << x << " | " << #y << ": " << y << endl
#define trace3(x, y, z)                                                        \
  cerr << #x << ":" << x << " | " << #y << ": " << y << " | " << #z << ": "    \
       << z << endl
#define trace4(a, b, c, d)                                                     \
  cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": "   \
       << c << " | " << #d << ": " << d << endl
#define trace5(a, b, c, d, e)                                                  \
  cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": "   \
       << c << " | " << #d << ": " << d << " | " << #e << ": " << e << endl
#define trace6(a, b, c, d, e, f)                                               \
  cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": "   \
       << c << " | " << #d << ": " << d << " | " << #e << ": " << e << " | "   \
       << #f << ": " << f << endl
#define testcases                                                              \
  int testcases;                                                               \
  cin >> testcases;                                                            \
  while (testcases--)
#define queries                                                                \
  int queries;                                                                 \
  cin >> queries;                                                              \
  while (queries--)

/*###   TO PRINT   ###*/

#define pp1(a) cout << a << endl;
#define pp2(a, b) cout << a << " " << b << endl;
#define pp3(a, b, c) cout << a << " " << b << " " << c << endl;
#define pp4(a, b, c, d) cout << a << " " << b << " " << c << " " << d << endl;
#define pp5(a, b, c, d, e)                                                     \
  cout << a << " " << b << " " << c << " " << d << " " << e << endl;

/*###   SSSSSSS   ###*/

#define INF INT_MAX

#define endl "\n"
#define ll long long
#define int long long

ll mod = 1e9 + 7;

#define pb push_back
#define mp make_pair

#define pii pair<int, int>
#define msi map<string, int>
#define vi vector<int>
#define vpii vector<pair<int, int>>

#define ff first
#define ss second
#define sz size()

#define REP(i, a, b) for (int i = a; i <= b; i++)
#define REP1(i, a, b) for (int i = a; i < b; i++)
#define f0(n) for (ll i = 0; i < n; i++)
#define f(n) for (ll i = 1; i <= n; i++)
#define fn(a, n) for (ll a = 0; a < n; a++)
#define flr(a, l, r) for (ll a = l; a <= r; a++)

#define sorta(a) sort(a.begin(), a.end());
#define sortd(a) sort(a.begin(), a.end(), greater<ll>());
#define sortdp(a) sort(a.begin(), a.end(), greater<pair<ll, ll>>());

#define blb(a, b) lower_bound(all(a), b) - a.begin();
#define bub(a, b) upper_bound(all(a), b) - a.begin();

#define stop return 0

/*###   COMPARATOR   ###*/

bool rev(int x, int y) { return x > y; }

/*###   PAIR_SORT_IN_DESCENDING_ORDER  ###*/

bool sortinrev(const pair<int, int> &a, const pair<int, int> &b) {
  return (a.first > b.first);
}

/*###   MODULO   ###*/

int modulo(int x, int N) { return (x % N + N) % N; }

/*###   MAX & MIN   ###*/

int max(int a, int b) {
  if (a >= b)
    return a;
  else
    return b;
}

int min(int a, int b) {
  if (a <= b)
    return a;
  else
    return b;
}

/*###   MOD-DIFFERENCE   ###*/

ll diff(ll a, ll b) {
  if (a >= b)
    return a - b;
  else
    return b - a;
}

/*###   PAIR-SORTING   ###*/

void pairsort(int a[], int b[], ll n) {
  pair<int, int> pairt[n];
  for (int i = 0; i < n; i++) {
    pairt[i].first = a[i];
    pairt[i].second = b[i];
  }

  sort(pairt, pairt + n);

  for (int i = 0; i < n; i++) {
    a[i] = pairt[i].first;
    b[i] = pairt[i].second;
  }
}

/*###   GCD && LCM   ###*/

ll gcd(ll a, ll b) {
  if (b == 0)
    return a;
  return gcd(b, a % b);
}

ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }

/*###   PRIME OR NOT   ###*/

int isPrime(int n) {
  if (n < 2)
    return 0;
  if (n < 4)
    return 1;
  if (n % 2 == 0 or n % 3 == 0)
    return 0;
  for (int i = 5; i * i <= n; i += 6)
    if (n % i == 0 or n % (i + 2) == 0)
      return 0;
  return 1;
}

/*###   nCr   ###*/

long long C(int n, int r) {
  if (r > n - r)
    r = n - r;
  long long ans = 1;
  int i;
  for (i = 1; i <= r; i++) {
    ans *= n - r + i;
    ans /= i;
  }

  return ans;
}

/*###   MODULAR-EXPONENTIATION   ###*/

ll modexpo(ll x, ll p) {
  ll res = 1;
  x = x % mod;
  while (p) {
    if (p % 2)
      res = res * x;
    p >>= 1;
    x = x * x % mod;
    res %= mod;
  }
  return res;
}

uint64_t mul_mod(uint64_t a, uint64_t b, uint64_t m) {
  long double x;
  uint64_t c;
  int64_t r;
  if (a >= m)
    a %= m;
  if (b >= m)
    b %= m;
  x = a;
  c = x * b / m;
  r = (int64_t)(a * b - c * m) % (int64_t)m;
  return r < 0 ? r + m : r;
}

/*###   STRING TO INT   ###*/

int sti(string s) {

  int ans = 0;
  int p = 1;

  for (int i = s.size() - 1; i >= 0; i--) {
    ans = (ans + ((ll)(s[i] - '0') * p) % mod) % mod;
    p = (p * 10) % mod;
  }
  return ans;
}

/*###   TIMER   ###*/

void time() {
#ifndef ONLINE_JUDGE
  cout << "\nTime: " << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
#endif
}

/*************************** END OF TEMPLATE ****************************/

const int N = 1e6 + 5;

int32_t main() {
#ifndef ONLINE_JUDGE
  freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
#endif

  IOS int n;
  cin >> n;
  vi h(n + 1);
  flr(i, 1, n) { cin >> h[i]; }
  vi dp(n + 1);
  // dp[0]=h[0];
  dp[1] = 0;
  dp[2] = abs(h[2] - h[1]);
  flr(i, 3, n) {
    dp[i] = min((dp[i - 1] + abs(h[i] - h[i - 1])),
                (dp[i - 2] + abs(h[i] - h[i - 2])));
  }
  cout << dp[n] << endl;

  // time();
  stop;
}

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

/*###   FAST-IO  ###*/

#define IOS                                                                    \
  ios::sync_with_stdio(0);                                                     \
  cin.tie(0);                                                                  \
  cout.tie(0);

/*###   DEBUGGGGGGG   ###*/

#define trace1(x) cerr << #x << ": " << x << endl
#define trace2(x, y) cerr << #x << ": " << x << " | " << #y << ": " << y << endl
#define trace3(x, y, z)                                                        \
  cerr << #x << ":" << x << " | " << #y << ": " << y << " | " << #z << ": "    \
       << z << endl
#define trace4(a, b, c, d)                                                     \
  cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": "   \
       << c << " | " << #d << ": " << d << endl
#define trace5(a, b, c, d, e)                                                  \
  cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": "   \
       << c << " | " << #d << ": " << d << " | " << #e << ": " << e << endl
#define trace6(a, b, c, d, e, f)                                               \
  cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": "   \
       << c << " | " << #d << ": " << d << " | " << #e << ": " << e << " | "   \
       << #f << ": " << f << endl
#define testcases                                                              \
  int testcases;                                                               \
  cin >> testcases;                                                            \
  while (testcases--)
#define queries                                                                \
  int queries;                                                                 \
  cin >> queries;                                                              \
  while (queries--)

/*###   TO PRINT   ###*/

#define pp1(a) cout << a << endl;
#define pp2(a, b) cout << a << " " << b << endl;
#define pp3(a, b, c) cout << a << " " << b << " " << c << endl;
#define pp4(a, b, c, d) cout << a << " " << b << " " << c << " " << d << endl;
#define pp5(a, b, c, d, e)                                                     \
  cout << a << " " << b << " " << c << " " << d << " " << e << endl;

/*###   SSSSSSS   ###*/

#define INF INT_MAX

#define endl "\n"
#define ll long long
#define int long long

ll mod = 1e9 + 7;

#define pb push_back
#define mp make_pair

#define pii pair<int, int>
#define msi map<string, int>
#define vi vector<int>
#define vpii vector<pair<int, int>>

#define ff first
#define ss second
#define sz size()

#define REP(i, a, b) for (int i = a; i <= b; i++)
#define REP1(i, a, b) for (int i = a; i < b; i++)
#define f0(n) for (ll i = 0; i < n; i++)
#define f(n) for (ll i = 1; i <= n; i++)
#define fn(a, n) for (ll a = 0; a < n; a++)
#define flr(a, l, r) for (ll a = l; a <= r; a++)

#define sorta(a) sort(a.begin(), a.end());
#define sortd(a) sort(a.begin(), a.end(), greater<ll>());
#define sortdp(a) sort(a.begin(), a.end(), greater<pair<ll, ll>>());

#define blb(a, b) lower_bound(all(a), b) - a.begin();
#define bub(a, b) upper_bound(all(a), b) - a.begin();

#define stop return 0

/*###   COMPARATOR   ###*/

bool rev(int x, int y) { return x > y; }

/*###   PAIR_SORT_IN_DESCENDING_ORDER  ###*/

bool sortinrev(const pair<int, int> &a, const pair<int, int> &b) {
  return (a.first > b.first);
}

/*###   MODULO   ###*/

int modulo(int x, int N) { return (x % N + N) % N; }

/*###   MAX & MIN   ###*/

int max(int a, int b) {
  if (a >= b)
    return a;
  else
    return b;
}

int min(int a, int b) {
  if (a <= b)
    return a;
  else
    return b;
}

/*###   MOD-DIFFERENCE   ###*/

ll diff(ll a, ll b) {
  if (a >= b)
    return a - b;
  else
    return b - a;
}

/*###   PAIR-SORTING   ###*/

void pairsort(int a[], int b[], ll n) {
  pair<int, int> pairt[n];
  for (int i = 0; i < n; i++) {
    pairt[i].first = a[i];
    pairt[i].second = b[i];
  }

  sort(pairt, pairt + n);

  for (int i = 0; i < n; i++) {
    a[i] = pairt[i].first;
    b[i] = pairt[i].second;
  }
}

/*###   GCD && LCM   ###*/

ll gcd(ll a, ll b) {
  if (b == 0)
    return a;
  return gcd(b, a % b);
}

ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }

/*###   PRIME OR NOT   ###*/

int isPrime(int n) {
  if (n < 2)
    return 0;
  if (n < 4)
    return 1;
  if (n % 2 == 0 or n % 3 == 0)
    return 0;
  for (int i = 5; i * i <= n; i += 6)
    if (n % i == 0 or n % (i + 2) == 0)
      return 0;
  return 1;
}

/*###   nCr   ###*/

long long C(int n, int r) {
  if (r > n - r)
    r = n - r;
  long long ans = 1;
  int i;
  for (i = 1; i <= r; i++) {
    ans *= n - r + i;
    ans /= i;
  }

  return ans;
}

/*###   MODULAR-EXPONENTIATION   ###*/

ll modexpo(ll x, ll p) {
  ll res = 1;
  x = x % mod;
  while (p) {
    if (p % 2)
      res = res * x;
    p >>= 1;
    x = x * x % mod;
    res %= mod;
  }
  return res;
}

uint64_t mul_mod(uint64_t a, uint64_t b, uint64_t m) {
  long double x;
  uint64_t c;
  int64_t r;
  if (a >= m)
    a %= m;
  if (b >= m)
    b %= m;
  x = a;
  c = x * b / m;
  r = (int64_t)(a * b - c * m) % (int64_t)m;
  return r < 0 ? r + m : r;
}

/*###   STRING TO INT   ###*/

int sti(string s) {

  int ans = 0;
  int p = 1;

  for (int i = s.size() - 1; i >= 0; i--) {
    ans = (ans + ((ll)(s[i] - '0') * p) % mod) % mod;
    p = (p * 10) % mod;
  }
  return ans;
}

/*###   TIMER   ###*/

void time() {
#ifndef ONLINE_JUDGE
  cout << "\nTime: " << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
#endif
}

/*************************** END OF TEMPLATE ****************************/

const int N = 1e6 + 5;

int32_t main() {
  // #ifndef ONLINE_JUDGE
  // freopen("input.txt", "r", stdin);
  // //freopen("output.txt", "w", stdout);
  // #endif

  IOS int n;
  cin >> n;
  vi h(n + 1);
  flr(i, 1, n) { cin >> h[i]; }
  vi dp(n + 1);
  // dp[0]=h[0];
  dp[1] = 0;
  dp[2] = abs(h[2] - h[1]);
  flr(i, 3, n) {
    dp[i] = min((dp[i - 1] + abs(h[i] - h[i - 1])),
                (dp[i - 2] + abs(h[i] - h[i - 2])));
  }
  cout << dp[n] << endl;

  // time();
  stop;
}