View Compilation Error

0_0_30217253_27926.cpp: In function 'int main()':
0_0_30217253_27926.cpp:83:40: error: 'GetNumber' was not declared in this scope
                 int L=GetNumber(1,1,n,l),R=GetNumber(1,1,n,r);
                                        ^
0_0_30217253_27926.cpp:84:27: error: 'R' was not declared in this scope
                 while (L!=R) if (L<R) R/=2; else L/=2;
                           ^