View Compilation Error

0_0_37556476_12331.cpp: In function 'int main()':
0_0_37556476_12331.cpp:154:46: error: 'down' was not declared in this scope
         for(int i=1;i<=n;i++)printf("%d",max(down[i][0]+up[i][1],down[i][1]+up[i][0]));
                                              ^