View Compilation Error

0_0_21498863_4748.cpp: In function 'void init()':
0_0_21498863_4748.cpp:52:2: error: expected ';' before 'for'
  for (int i = 2; i < maxn; i++) {
  ^
0_0_21498863_4748.cpp:52:18: error: 'i' was not declared in this scope
  for (int i = 2; i < maxn; i++) {
                  ^