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  1. //problem 3
  2.  
  3. #include <bits/stdc++.h>
  4. using namespace std;
  5.  
  6. int n, m;
  7. char grid[105][105];
  8. int vis[105][105];
  9. int level[105][105];
  10. pair<int,int> par[105][105];
  11.  
  12. vector<pair<int, int>> b = {{2, 1}, {2, -1}, {1, 2}, {1, -2}, 
  13.                             {-2, 1}, {-2, -1}, {-1, 2}, {-1, -2}};
  14.  
  15. bool valid(int i, int j) {
  16.     return !(i < 0 || i >= n || j < 0 || j >= m);
  17. }
  18.  
  19. void bfs(int si, int sj) {
  20.     queue<pair<int, int>> q;
  21.     q.push({si, sj});
  22.     vis[si][sj] = true;
  23.     level[si][sj] = 0;
  24.  
  25.     while(!q.empty()) {
  26.         int pi = q.front().first;
  27.         int pj = q.front().second;
  28.         q.pop();
  29.  
  30.         for (int i = 0; i < 8; i++) {
  31.             int ci = pi + b[i].first;
  32.             int cj = pj + b[i].second;
  33.  
  34.             if(valid(ci, cj) && !vis[ci][cj]) {
  35.                 q.push({ci, cj});
  36.                 vis[ci][cj] = true;
  37.                 level[ci][cj] = level[pi][pj] + 1;
  38.                 par[ci][cj] = {pi,pj};
  39.             }
  40.         }
  41.     }
  42. }
  43.  
  44.  
  45.  
  46. int main() {
  47.  
  48.     int t; cin >> t;
  49.  
  50.     while(t--) {
  51.         cin >> n >> m;
  52.  
  53.         int ki, kj, qi, qj; 
  54.         cin >> ki >> kj;
  55.         cin >> qi >> qj;
  56.  
  57.         memset(vis, false, sizeof(vis));
  58.         memset(level, -1, sizeof(level));
  59.         memset(par, -1, sizeof(par));
  60.  
  61.         bfs(ki, kj);
  62.  
  63.         cout << level[qi][qj] << endl;
  64.     }
  65.  
  66.     return 0;
  67. }
  68.  
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/WIRwB4
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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