foo.cc:15:1: error: 'bo0l' does not name a type; did you mean 'bool'?
 bo0l DFS( vector<vector<int>> &visited, int x,int y, int step)
 ^~~~
 bool
foo.cc: In function 'int main()':
foo.cc:114:3: error: 'DFS' was not declared in this scope
   DFS(visited, x2, y2, 0);
   ^~~