View Compilation Error

0_0_30159141_712.cpp: In function 'int main()':
0_0_30159141_712.cpp:31:22: error: request for member 'clear' in 'a[i]', which is of non-class type 'long long int'
             vec[a[i].clear();
                      ^
0_0_30159141_712.cpp:31:29: error: expected ']' before ';' token
             vec[a[i].clear();
                             ^