View Compilation Error

0_0_38988719_1159.cpp: In function 'void solve()':
0_0_38988719_1159.cpp:34:38: error: 'sum' was not declared in this scope; did you mean 'suf'?
   34 |                 for (int j = 0; j <= sum; j++) {
      |                                      ^~~
      |                                      suf