View Compilation Error

0_0_21501362_15117.cpp: In function 'int main()':
0_0_21501362_15117.cpp:51:25: error: 'L' was not declared in this scope
         for(long long i=L;i<=R;i++)
                         ^
0_0_21501362_15117.cpp:51:30: error: 'R' was not declared in this scope
         for(long long i=L;i<=R;i++)
                              ^