View Compilation Error

0_0_38768104_9247.cpp: In function 'int main()':
0_0_38768104_9247.cpp:19:62: error: incompatible types in assignment of 'int' to 'int [31]'
   19 |                                 if(vis[now]==0)cnt++,vis[now]=1,a[i]=i,b[j]=j;
      |                                                      ~~~~~~~~^~