View Compilation Error

0_0_27904206_19613.cpp: In function 'int main()':
0_0_27904206_19613.cpp:17:42: error: 'A' was not declared in this scope
     dp[i][j] = min(dp[i-1][j] +a[i-1][j]*A[i][j], dp[i][j]);
                                          ^