View Compilation Error

0_0_20835931_30801.cpp:49:1: error: 'LL' does not name a type
 LL LCP(int x,int y){
 ^
0_0_20835931_30801.cpp: In function 'int main()':
0_0_20835931_30801.cpp:67:17: error: 'LCP' was not declared in this scope
  int L=LCP(j,j+i);
                 ^