View Compilation Error

0_0_17023208_22247.cpp: In function 'void dfs(int, int, int)':
0_0_17023208_22247.cpp:31:62: error: 'fa' was not declared in this scope
         if(nx==s&&ny==t&&d==3&&maze[nx][ny]==c&&vis[nx][ny]&&fa[nx][ny]==nx*m+ny)
                                                              ^
0_0_17023208_22247.cpp:55:62: error: 'fa' was not declared in this scope
         if(nx==s&&ny==t&&d==3&&maze[nx][ny]==c&&vis[nx][ny]&&fa[nx][ny]==nx*m+ny)
                                                              ^
0_0_17023208_22247.cpp: In function 'int main()':
0_0_17023208_22247.cpp:70:16: error: 'fa' was not declared in this scope
         memset(fa,-1,sizeof(fa));
                ^