Problem p02775 (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__)
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
          oneforall int dp[2][10000];
  ins(a);
  dp[0][0] = a[0] - '0';
  dp[1][0] = 11 - (a[0] - '0');
  FOR(i, 1, a.size()) {
    dp[0][i] = min(dp[0][i - 1], dp[1][i - 1]) + a[i] - '0';
    dp[1][i] =
        min(dp[0][i - 1] + 11 - (a[i] - '0'), dp[1][i - 1] + 9 - (a[i] - '0'));
  }
  out(min(dp[0][a.size() - 1], dp[1][a.size() - 1]));
  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__)
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
          oneforall int dp[2][10000010];
  ins(a);
  dp[0][0] = a[0] - '0';
  dp[1][0] = 11 - (a[0] - '0');
  FOR(i, 1, a.size()) {
    dp[0][i] = min(dp[0][i - 1], dp[1][i - 1]) + a[i] - '0';
    dp[1][i] =
        min(dp[0][i - 1] + 11 - (a[i] - '0'), dp[1][i - 1] + 9 - (a[i] - '0'));
  }
  out(min(dp[0][a.size() - 1], dp[1][a.size() - 1]));
  return 0;
}