View Compilation Error

0_0_35916853_17948.cpp: In function 'int main()':
0_0_35916853_17948.cpp:16:6: error: request for member 'push_back' in 'A', which is of non-class type 'int [51]'
    A.push_back((a*A[i-1]+b*A[i-2])%7);
      ^