View Compilation Error

1_868_6846_27109.cpp: In function 'int main()':
1_868_6846_27109.cpp:41:22: error: 'n' was not declared in this scope
  while ((scanf("%d",&n))!=EOF)
                      ^
1_868_6846_27109.cpp:57:17: error: 'k' was not declared in this scope
   int e = ss(t, k);
                 ^