View Compilation Error

0_0_30695725_21989.cpp: In function 'long long int C(long long int, long long int, long long int)':
0_0_30695725_21989.cpp:86:5: error: 'x' was not declared in this scope
  if(x<y||y<0)return 0;
     ^
0_0_30695725_21989.cpp:86:7: error: 'y' was not declared in this scope
  if(x<y||y<0)return 0;
       ^