func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long N = 1e3 + 100, inf = 1e15;   long long dis[N][N][6], clr[6][6], ans = inf;   queue<pair<int, int> > q[3];   char a[N][N];   bool mark[N][N][6];   pair<int, int> k;   int ki, kj, n, m, x, y;   int xx[] = {0, 1, 0, -1}, yy[] = {1, 0, -1, 0};   bool is_vallid(int x, int y) {     if (x >= 0 && x < n && y >= 0 && y < m) return 1;     return 0;   }   void init() {     for (int i = 0; i < 3; i++)       for (int j = 0; j < 3; j++) clr[i][j] = inf;     for (int i = 0; i < N; i++)       for (int j = 0; j < N; j++)         for (int c = 0; c < 4; c++) dis[i][j][c] = inf;   }   void bfs(int b) {     while (!q[b].empty()) {       k = q[b].front();       ki = k.first, kj = k.second;       if (a[ki][kj] -  1  != b && a[ki][kj] !=  #  && a[ki][kj] !=  . )         clr[b][a[ki][kj] -  1 ] = min(dis[ki][kj][b], clr[b][a[ki][kj] -  1 ]);       for (int i = 0; i < 4; i++) {         x = ki + xx[i], y = kj + yy[i];         if (is_vallid(x, y) && a[x][y] !=  #  && !mark[x][y][b]) {           q[b].push({x, y});           dis[x][y][b] = dis[ki][kj][b] + 1;           mark[x][y][b] = 1;         }       }       q[b].pop();     }   }   int main() {     init();     cin >> n >> m;     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++) {         cin >> a[i][j];         if (a[i][j] !=  .  && a[i][j] !=  # ) {           q[a[i][j] -  1 ].push({i, j});           mark[i][j][a[i][j] -  1 ] = 1;           dis[i][j][a[i][j] -  1 ] = 0;         }       }     for (int i = 0; i < 3; i++) bfs(i);     ans = min(min(clr[0][1] + clr[0][2], clr[1][0] + clr[1][2]),               clr[2][0] + clr[2][1]);     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++)         ans = min(ans, dis[i][j][0] + dis[i][j][1] + dis[i][j][2]);     if (ans >= inf) {       cout << -1;       return 0;     }     cout << ans - 2;   }   