Language: C++

#include <bits/stdc++.h>

#ifndef INCLUDE_ZOBRIST_HASH_HPP
#define INCLUDE_ZOBRIST_HASH_HPP

#include <random>
#include <iostream>
#include <typeinfo>

namespace orislib {

template <typename T, int W, int H, int STATE>
struct ZobristHash {
  typedef T hash_t;
  ZobristHash() {
    std::random_device rd;
    std::mt19937 mt(rd());
    std::uniform_int_distribution<T> dist;
    for (int h = 0; h < H; h++) {
      for (int w = 0; w < W; w++) {
        for (int s = 0; s < STATE; s++) {
          rands[h][w][s] = dist(mt);
        }
      }
    }
  }
  template <typename TT>
  hash_t hash(TT data[H][W]) {
    hash_t r = 0;
    for (int h = 0; h < H; h++) {
      for (int w = 0; w < W; w++) {
        r ^= rands[h][w][data[h][w]];
      }
    }
    return r;
  }
  hash_t rands[H][W][STATE];
};
}

#endif
using namespace std;
using namespace orislib;

typedef long long ll;
typedef long double ld;
typedef tuple<int, int> duo;
const int dx[] = {0, 0, 1, -1, 1, 1, -1, -1};
const int dy[] = {1, -1, 0, 0, 1, -1, 1, -1};
const int Mod = 1000000000 + 0;
//{{{ templates
#define TT_             \
  template <typename T> \
  inline
#define TTF_                        \
  template <typename T, typename F> \
  inline
TT_ T sq(T x) { return x * x; }
TT_ T In() {
  T x;
  cin >> x;
  return x;
}
TT_ void Out(T& x) { cout << x; }
TT_ void sort(T& v) { sort(begin(v), end(v)); }
TT_ void revs(T& v) { reverse(begin(v), end(v)); }
TT_ void uniq(T& v) {
  sort(v);
  v.erase(unique(begin(v), end(v)), end(v));
}
TT_ int ubnd(T& v, typename T::value_type& x) {
  return upper_bound(begin(v), end(v), x) - begin(v);
}
TT_ int lbnd(T& v, typename T::value_type& x) {
  return lower_bound(begin(v), end(v), x) - begin(v);
}
TTF_ void inpt(T& v, int n, F f) {
  for (v.reserve(n); n--; v.emplace_back(f()))
    ;
}
TTF_ void show(T& v, F f, string d = " ", string e = "\n") {
  int i = 0;
  for (auto& x : v) i++&&(cout << d), f(x);
  cout << e;
}
TT_ typename T::iterator minel(T& v) { return min_element(begin(v), end(v)); }
TT_ typename T::iterator maxel(T& v) { return max_element(begin(v), end(v)); }

inline void fast_io() {
  ios::sync_with_stdio(0);
  cin.tie(0);
}
inline int in() {
  int x;
  scanf("%d", &x);
  return x;
}
inline ll pow_mod(ll a, ll k, ll m) {
  ll r = 1;
  for (; k > 0; a = a * a % m, k >>= 1)
    if (k & 1) r = r * a % m;
  return r;
}
inline ll mod_inv(ll a, ll p) { return pow_mod(a, p - 2, p); }
//}}} priority_queue queue deque front stringstream max_element min_element
//insert count make_tuple

struct Board {
  Board() {}
  Board(const vector<vector<int>>& v) {
    memset(b, '#', sizeof(b));
    for (int i = 0; i < 5; i++) b[i][5] = 0;
    for (int i = 0; i < v[0].size(); i++) b[0][2 + i] = conv_hex(v[0][i]);
    for (int i = 0; i < v[1].size(); i++) b[1][1 + i] = conv_hex(v[1][i]);
    for (int i = 0; i < v[2].size(); i++) b[2][0 + i] = conv_hex(v[2][i]);
    for (int i = 0; i < v[3].size(); i++) b[3][1 + i] = conv_hex(v[3][i]);
    for (int i = 0; i < v[4].size(); i++) b[4][2 + i] = conv_hex(v[4][i]);
    int it = 0;
    for (int i = 0; i < 5; i++) {
      for (int j = 0; j < 5; j++) {
        if (b[i][j] == '0') {
          cx[it] = j;
          cy[it] = i;
          it++;
        }
      }
    }
    turn = 0;
  }
  char conv_hex(int a) { return "0123456789ABCDEF"[a]; }
  bool slide(int index, int dir) {
    int px = cx[index], py = cy[index];
    int nx = px + dx[dir], ny = py + dy[dir];
    if (invalid(nx, ny)) return false;
    if (b[ny][nx] == '#') return false;
    if (b[ny][nx] == '0') return false;
    swap(b[py][px], b[ny][nx]);
    cx[index] = nx;
    cy[index] = ny;
    turn++;
    return true;
  }
  bool is_ok() {
    static const char cb[5][6] = {
        "##0##", "#123#", "45678", "#9AB#", "##0##", };
    return memcmp(cb, b, sizeof(cb)) == 0;
  }
  bool invalid(int x, int y) { return x < 0 || x >= 5 || y < 0 || y >= 5; }
  char b[5][6];
  int cx[2], cy[2];
  int turn;
};

int main() {
  ZobristHash<int, 6, 5, 256> zh;
  int h;
  while (h = in(), h != -1) {
    vector<vector<int>> vs(5);
    vs[0].emplace_back(h);
    inpt(vs[1], 3, in);
    inpt(vs[2], 5, in);
    inpt(vs[3], 3, in);
    inpt(vs[4], 1, in);
    Board b(vs);
    queue<Board> Q;
    set<int> vis;
    Q.push(b);
    vis.insert(zh.hash(b.b));

    while (!Q.empty()) {
      Board bi = Q.front();
      Q.pop();
      if (bi.turn > 15) break;
      if (bi.is_ok()) {
        cout << bi.turn << endl;
        goto END;
      }
      for (int i = 0; i < 2; i++) {
        for (int d = 0; d < 4; d++) {
          Board bii = bi;
          if (!bii.slide(i, d)) continue;
          int hv = zh.hash(bii.b);
          if (vis.count(hv)) continue;
          vis.insert(hv);
          Q.push(bii);
        }
      }
    }
  }
  cout << "NA" << endl;
END:
  ;
}
return 0;
}

Compiler output:
a.cc:194:1: error: expected unqualified-id before 'return'
  194 | return 0;
      | ^~~~~~
a.cc:195:1: error: expected declaration before '}' token
  195 | }
      | ^