View Compilation Error

0_0_39454564_17222.cpp: In function 'void sol(int, int, int)':
0_0_39454564_17222.cpp:38:21: error: 'vis' was not declared in this scope
   38 |                 if(!vis[x])now[y]+=now[x],ans[y]+=now[x];
      |                     ^~~