View Compilation Error

0_0_36593360_26439.cpp:51:2: error: expected initializer before 'int'
  int L=0,R=sum;
  ^
0_0_36593360_26439.cpp:52:2: error: expected unqualified-id before 'while'
  while(L<R)
  ^
0_0_36593360_26439.cpp:58:2: error: expected unqualified-id before 'return'
  return L;
  ^
0_0_36593360_26439.cpp:59:1: error: expected declaration before '}' token
 }
 ^