foo.cc:3:27: error: conflicting declaration 'int b [100001]'
 int n,b,e[100001],b[100001],r[200002],l[200002];
                           ^
foo.cc:3:7: note: previous declaration as 'int b'
 int n,b,e[100001],b[100001],r[200002],l[200002];
       ^
foo.cc: In function 'int main()':
foo.cc:11:23: error: invalid types 'int[int]' for array subscript
   if(e[i]==b) {t=i;b[i]=0;}
                       ^
foo.cc:12:22: error: invalid types 'int[int]' for array subscript
   else if(e[i]>b) b[i]=1;
                      ^
foo.cc:13:11: error: invalid types 'int[int]' for array subscript
   else b[i]=-1;
           ^
foo.cc:18:11: error: invalid types 'int[int]' for array subscript
   sum+=b[i];
           ^
foo.cc:24:11: error: invalid types 'int[int]' for array subscript
   sum+=b[i];
           ^