View Compilation Error

0_0_18223397_14798.cpp: In function 'int main()':
0_0_18223397_14798.cpp:18:18: error: 'n' was not declared in this scope
   LL ans=(2*a*a+(n&1?-1:1))/8;
                  ^
0_0_18223397_14798.cpp:19:11: error: 'm' was not declared in this scope
   if(ans<=m)
           ^