View Compilation Error

0_0_28085354_14775.cpp: In function 'int main()':
0_0_28085354_14775.cpp:38:40: error: 'aim' was not declared in this scope
         for(int i=2;i<=c+1;i++) ans+=a[aim[1]][aim[i]]+a[aim[i]][aim[1]];
                                        ^