View Compilation Error

0_0_30185268_22120.cpp:14:14: error: 'itn' has not been declared
  node(int _x,itn _y)
              ^
0_0_30185268_22120.cpp: In function 'void bfs()':
0_0_30185268_22120.cpp:24:17: error: 'n' was not declared in this scope
  for(int i=1;i<=n;i++)
                 ^
0_0_30185268_22120.cpp:29:4: error: 'n' was not declared in this scope
  d[n][n]=a[n][n];
    ^
0_0_30185268_22120.cpp:29:10: error: 'a' was not declared in this scope
  d[n][n]=a[n][n];
          ^
0_0_30185268_22120.cpp:39:2: error: expected '(' before '}' token
  }
  ^
0_0_30185268_22120.cpp: In function 'int main()':
0_0_30185268_22120.cpp:44:7: error: 'n' was not declared in this scope
  cin>>n;
       ^
0_0_30185268_22120.cpp:47:8: error: 'a' was not declared in this scope
   cin>>a[i][j];
        ^
0_0_30185268_22120.cpp:47:13: error: 'j' was not declared in this scope
   cin>>a[i][j];
             ^