View Compilation Error

0_0_14612135_20255.cpp:33:1: error: 'll' does not name a type
 ll calcSubTreePair(vector<int> &ds){
 ^
0_0_14612135_20255.cpp: In function 'int main()':
0_0_14612135_20255.cpp:90:13: error: 'll' was not declared in this scope
             ll ans = calcSubTreePair(f);
             ^
0_0_14612135_20255.cpp:91:21: error: 'ans' was not declared in this scope
             cout << ans << endl;
                     ^