View Compilation Error

0_0_24688602_31842.cpp:1:2: error: expected unqualified-id before '<' token
  < len; i++) {
  ^
0_0_24688602_31842.cpp:1:9: error: 'i' does not name a type
  < len; i++) {
         ^
0_0_24688602_31842.cpp:7:11: error: expected constructor, destructor, or type conversion before '(' token
     printf("%lld\n", ans);
           ^
0_0_24688602_31842.cpp:8:1: error: expected declaration before '}' token
 }
 ^