Revise paste acmp - 99

#include <bits/stdc++.h>
#define lvl first
#define row second.first
#define col second.second

using namespace std;

int h, n, m, d[51][51][51];
char table[51][51][51];
pair<int, pair<int, int>> s, f;
pair<int, pair<int, int>> dir[5] = {{0, {-1, 0}}, {0, {0, +1}}, {0, {+1, 0}}, {0, {0, -1}}, {+1, {0, 0}}};
bool used[51][51][51];
queue<pair<int, pair<int, int>>> q;

bool check(int lv, int r, int c) {
    return (1 <= lv && lv <= h && 1 <= r && r <= n && 1 <= c && c <= m && table[lv][r][c] != 'o');
}

int main() {
    cin >> h >> n >> m;
    for (int k = 1; k <= h; ++k) {
        for (int i = 1; i <= n; ++i) {
            for (int j = 1; j <= m; ++j) {
                cin >> table[k][i][j];
                if (table[k][i][j] == '1') {
                    s = {k, {i, j}};
                    d[k][i][j] = 0;
                    used[k][i][j] = true;
                    q.push({k, {i, j}});
                } else if (table[k][i][j] == '2') {
                    f = {k, {i, j}};
                } 
            }
        }
    }
    
    while (!q.empty()) {
        auto v = q.front();
        q.pop();
        for (int i = 0; i < 5; ++i) {
            int k = v.lvl + dir[i].lvl;
            int x = v.row + dir[i].row;
            int y = v.col + dir[i].col;
            
            if (check(k, x, y) && !used[k][x][y]) {
                used[k][x][y] = true;
                d[k][x][y] = d[v.lvl][v.row][v.col] + 1;
                q.push({k, {x, y}});
            }
        }
    }
    
    cout << d[f.lvl][f.row][f.col] * 5;
    return 0;
}