Sokkelo

#include <iostream>
#include <queue>
#include <vector>

bool kartta[1000][1000];
int64_t e[1000][1000];
bool z[1000][1000];

uint32_t n, m;

std::vector<std::pair<std::pair<uint32_t, uint32_t>, int64_t>>
naap(uint32_t y, uint32_t x) {
  std::vector<std::pair<std::pair<uint32_t, uint32_t>, int64_t>> res = {};
  bool tm = kartta[y][x];
  if (y != 0) {
    res.push_back({{y - 1, x}, (tm || kartta[y - 1][x]) * 100000 + 1});
  }
  if (y != n - 1) {
    res.push_back({{y + 1, x}, (tm || kartta[y + 1][x]) * 100000 + 1});
  }
  if (x != 0) {
    res.push_back({{y, x - 1}, (tm || kartta[y][x - 1]) * 100000 + 1});
  }
  if (x != m - 1) {
    res.push_back({{y, x + 1}, (tm || kartta[y][x + 1]) * 100000 + 1});
  }
  return res;
}

int main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);

  std::cin >> n >> m;

  uint32_t ax = 0, ay = 0;
  uint32_t bx = 0, by = 0;
  for (uint32_t i = 0; i < n; ++i) {
    for (uint32_t j = 0; j < m; ++j) {
      char c;
      std::cin >> c;
      switch (c) {
      case '#':
        kartta[i][j] = true;
        break;
      case 'A':
        ax = j;
        ay = i;
        break;
      case 'B':
        bx = j;
        by = i;
        break;
      }
    }
  }

  for (uint32_t i = 0; i < n; ++i) {
    for (uint32_t j = 0; j < m; ++j) {
      e[i][j] = INT64_C(1) << 60;
    }
  }
  e[ay][ax] = 0;
  std::priority_queue<std::pair<int64_t, std::pair<uint32_t, uint32_t>>> q = {};
  q.push({0, {ay, ax}});
  while (!q.empty()) {
    uint32_t y = q.top().second.first;
    uint32_t x = q.top().second.second;
    q.pop();
    if (z[y][x])
      continue;
    z[y][x] = true;
    for (auto b : naap(y, x)) {
      if (e[y][x] + b.second < e[b.first.first][b.first.second]) {
        e[b.first.first][b.first.second] = e[y][x] + b.second;
        q.push({-e[b.first.first][b.first.second], b.first});
      }
    }
  }

  if (e[by][bx] >= 100000) {
    std::cout << e[by][bx] / 100000 << '\n';
  } else {
    std::cout << "1\n";
  }
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: WRONG ANSWER

Test 4

Group: 2

Verdict: ACCEPTED

Test 5

Group: 2

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: WRONG ANSWER

Test 7

Group: 1, 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 1, 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: WRONG ANSWER

Test 12

Group: 1, 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 1, 2

Verdict: ACCEPTED

Test 15

Group: 2

Verdict: ACCEPTED

Test 16

Group: 2

Verdict: ACCEPTED

Test 17

Group: 2

Verdict: ACCEPTED