View Compilation Error

0_0_36451877_12796.cpp:46:8: error: 'LL' does not name a type
 inline LL Solve(LL L, LL R) {
        ^
0_0_36451877_12796.cpp: In function 'int main()':
0_0_36451877_12796.cpp:77:27: error: 'Solve' was not declared in this scope
         ll ans = Solve(l,r);
                           ^