View Compilation Error

0_0_20297079_13195.cpp: In function 'void find1(node)':
0_0_20297079_13195.cpp:24:29: error: could not convert '(node*)(& pre[now.node::x])' from 'node*' to 'node'
  find1(pre[now.x],pre[now.y]);
                             ^
0_0_20297079_13195.cpp: In function 'int main()':
0_0_20297079_13195.cpp:119:34: error: 'wall' was not declared in this scope
    wall(xx[i],yy[i],xx1[i],yy1[i]);
                                  ^