View Compilation Error

0_0_13316440_26488.cpp:9:18: error: 'LL' was not declared in this scope
 long long  solve(LL n)
                  ^
0_0_13316440_26488.cpp:10:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_13316440_26488.cpp: In function 'int main()':
0_0_13316440_26488.cpp:26:28: error: 'solve' cannot be used as a function
   printf("%I64d\n", solve(y)-solve(x-1));
                            ^
0_0_13316440_26488.cpp:26:39: error: 'solve' cannot be used as a function
   printf("%I64d\n", solve(y)-solve(x-1));
                                       ^