View Compilation Error

0_0_16002874_12543.cpp: In function 'void updata(int, int, int, int, int)':
0_0_16002874_12543.cpp:61:11: error: 'L' was not declared in this scope
  int m = (L + R) >> 1;
           ^
0_0_16002874_12543.cpp:61:15: error: 'R' was not declared in this scope
  int m = (L + R) >> 1;
               ^