View Compilation Error

0_0_21868493_26011.cpp: In function 'void _init()':
0_0_21868493_26011.cpp:22:19: error: 'N' was not declared in this scope
     for(int i=2;i<N;i++){
                   ^
0_0_21868493_26011.cpp: In function 'LL get_root(LL)':
0_0_21868493_26011.cpp:83:15: error: 'test' was not declared in this scope
     if(!test(n)) return -1;
               ^