View Compilation Error

0_0_32894190_9652.cpp: In function 'int Manacher::left(int)':
0_0_32894190_9652.cpp:24:26: error: 'lef' was not declared in this scope
  int left(int x){ return lef[(x + 1) << 1] - ((x+1) << 1); }
                          ^