View Compilation Error

0_0_38608588_3345.cpp: In function 'void dfs(int)':
0_0_38608588_3345.cpp:79:2: error: 'ans' was not declared in this scope
  ans[now]=tree.res[rt[now]];
  ^~~
0_0_38608588_3345.cpp:79:2: note: suggested alternative: 'abs'
  ans[now]=tree.res[rt[now]];
  ^~~
  abs