View Compilation Error

0_0_32855602_24855.cpp:1:1: error: expected unqualified-id before '<' token
 <span style="font-size:18px;"> l = (i - 1)/2 - (ans - 1)/2;
 ^
0_0_32855602_24855.cpp:2:13: error: 'r' does not name a type
             r = l + ans - 2;</span>//https://blog.csdn.net/newproblems/article/details/77598666
             ^
0_0_32855602_24855.cpp:2:29: error: expected unqualified-id before '<' token
             r = l + ans - 2;</span>//https://blog.csdn.net/newproblems/article/details/77598666
                             ^