View Compilation Error

0_0_37298072_30292.cpp:22:1: error: 'll' does not name a type
 ll sum(int x)
 ^
0_0_37298072_30292.cpp: In function 'int main()':
0_0_37298072_30292.cpp:49:18: error: 'sum' was not declared in this scope
       cout<<sum(i)<<" ";
                  ^