View Compilation Error

0_0_38497357_32365.cpp:11:1: error: 'LL' does not name a type
 LL check(int x)
 ^
0_0_38497357_32365.cpp: In function 'int main()':
0_0_38497357_32365.cpp:42:26: error: 'check' was not declared in this scope
             if (check(mid) >= m)
                          ^