View Compilation Error

0_0_39485861_9161.cpp:155:1: error: expected declaration before '}' token
  155 | }
      | ^
0_0_39485861_9161.cpp: In function 'void solve()':
0_0_39485861_9161.cpp:161:15: error: 'sg' was not declared in this scope
  161 |             B[sg[i - A[j]]] = 1;
      |               ^~