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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. #define ll long long
  6. #define ull unsigned ll
  7. #define ld long double
  8. typedef vector<int> vi;
  9. typedef multiset<int> mi;
  10. typedef multiset<ll> mll;
  11. typedef vector<ll> vll;
  12. typedef vector<bool> vb;
  13. typedef vector<string> vs;
  14. typedef set<ll> sll;
  15. typedef vector<vector<int>> _2vi;
  16. typedef vector<vector<ll>> _2vll;
  17. #define all(v) ((v).begin()), ((v).end())
  18. #define sz(v) ((ll)((v).size()))
  19.  
  20. #define vinp(v, n)                \
  21.     for (ull i = 0; i < (n); i++) \
  22.     cin >> (v)[i]
  23. #define printv(v)      \
  24.     for (auto i : (v)) \
  25.     cout << i << " "
  26. #define fr0(i, n) for (ull(i) = 0; (i) < (n); (i)++)
  27. #define fr1(i, n) for (ull(i) = 1; (i) < (n); (i)++)
  28. #define fr(i, x, n) for (ull(i) = (x); (i) < (n); (i)++)
  29. #define _CRT_SECURE_NO_WARNING
  30. const ll MOD = 1000000007;
  31.  
  32. void Bustany() {
  33.     ios_base::sync_with_stdio(false);
  34.     cin.tie(NULL);
  35.     cout.tie(NULL);
  36. #ifndef ONLINE_JUDGE
  37.     freopen("./in.txt", "r", stdin), freopen("./out.txt", "w", stdout);
  38. #endif
  39. }
  40.  
  41. //vector<sll> adj(N);
  42. vector<vector<char>> adj;
  43. vector<vector<ll>> vis;
  44.  
  45. ll n, m, d;
  46. ll dx[] = {0, 0, 1, -1};
  47. ll dy[] = {1, -1, 0, 0};
  48.  
  49.  
  50. void solve() {
  51.     cin >> n >> m >> d;
  52.     vis.assign(n, vll(m, -1));
  53.     adj.assign(n, vector<char>(m));
  54.     for (ll i = 0; i < n; i++) {
  55.         for (ll j = 0; j < m; j++) {
  56.             cin >> adj[i][j];
  57.         }
  58.     }
  59.     priority_queue<tuple<ll, ll, ll>,vector<tuple<ll,ll,ll>>,greater<tuple<ll,ll,ll>>> pq;
  60.     for (ll i = 0; i < n; i++) {
  61.         for (ll j = 0; j < m; j++) {
  62.             if (adj[i][j] == 'M') {
  63.                 pq.push({0, i, j});
  64.                 vis[i][j] = 0;
  65.             }
  66.         }
  67.     }
  68.     while (!pq.empty()) {
  69.         auto [di, x, y] = pq.top();
  70.         pq.pop();
  71.         if (di != vis[x][y])continue;
  72.         if(di==d)continue;
  73.         for (ll k = 0; k < 4; k++) {
  74.             ll nx = dx[k] + x, ny = dy[k] + y;
  75.             if (nx >= n || nx < 0 || ny >= m || ny < 0)continue;
  76.             if (vis[nx][ny] == -1 || vis[nx][ny] > di + 1) {
  77.                 vis[nx][ny] = di + 1;
  78.                 pq.push({di + 1, nx, ny});
  79.             }
  80.         }
  81.     }
  82.     for (ll i = 0; i < n; i++) {
  83.         for (ll j = 0; j < m; j++) {
  84.             if (adj[i][j] == 'S') {
  85.                 priority_queue<tuple<ll, ll, ll>,vector<tuple<ll,ll,ll>>,greater<tuple<ll,ll,ll>>> q;
  86.                 _2vll dist(n, vll(m, LONG_LONG_MAX));
  87.                 dist[i][j] = 0;
  88.                 if (vis[i][j] == -1)
  89.                     q.push({0, i, j});
  90.                 while (!q.empty()) {
  91.                     auto [di, x, y] = q.top();
  92.                     q.pop();
  93.                     if (di != dist[x][y])continue;
  94.                     if (adj[x][y] == 'F') {
  95.                         cout << di << endl;
  96.                         return;
  97.                     }
  98.                     fr0(k, 4) {
  99.                         ll nx = dx[k] + x, ny = dy[k] + y;
  100.                         if (nx >= n || nx < 0 || ny >= m || ny < 0 || vis[nx][ny] != -1)continue;
  101.                         if (dist[nx][ny] > di + 1) {
  102.                             dist[nx][ny] = di + 1;
  103.                             q.push({di + 1, nx, ny});
  104.                         }
  105.                     }
  106.                 }
  107.                 cout << -1 << endl;
  108.             }
  109.         }
  110.     }
  111.  
  112. }
  113.  
  114. int main() {
  115.     Bustany();
  116.     ll t = 1;
  117. //     cin >> t;
  118.     while (t--) {
  119.         solve();
  120.     }
  121. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/jBdykA
language:
C++ (gcc 8.3)
created:
9 hours ago
visibility:
public

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