View Compilation Error

0_0_21540961_14922.cpp: In function 'bool check(int, int)':
0_0_21540961_14922.cpp:105:6: error: 'j' was not declared in this scope
  if (j + 1 == i) return true;
      ^
0_0_21540961_14922.cpp:105:15: error: 'i' was not declared in this scope
  if (j + 1 == i) return true;
               ^