View Compilation Error

0_0_38779920_9348.cpp: In function 'int main()':
0_0_38779920_9348.cpp:47:30: error: 'len' was not declared in this scope
   47 |                         sum+=len[i];
      |                              ^~~
0_0_38779920_9348.cpp:49:22: error: 'len' was not declared in this scope
   49 |                 sort(len,len+n,cmp);
      |                      ^~~
0_0_38779920_9348.cpp:53:40: error: 'vis' was not declared in this scope
   53 |                                 memset(vis,0,sizeof(vis));
      |                                        ^~~
0_0_38779920_9348.cpp:62:21: error: 'flag' was not declared in this scope
   62 |                 if(!flag){
      |                     ^~~~
0_0_38779920_9348.cpp:63:40: error: expected ';' before '}' token
   63 |                         cout<<sum<<endl
      |                                        ^
      |                                        ;
   64 |                 }
      |                 ~