View Compilation Error

0_0_39416907_21530.cpp: In function 'void run()':
0_0_39416907_21530.cpp:43:34: error: 'i' was not declared in this scope
   43 |                 cout << "+" << a[i];
      |                                  ^
0_0_39416907_21530.cpp:44:21: error: 'i' was not declared in this scope
   44 |         } else if(a[i] == 0 && sum == 9) {
      |                     ^