View Compilation Error

0_0_33871022_15705.cpp: In function 'll C(int, int)':
0_0_33871022_15705.cpp:80:12: error: 'kx' was not declared in this scope
     return kx[y]*ky[x]%mod*ky[y-x]%mod;
            ^
0_0_33871022_15705.cpp:80:18: error: 'ky' was not declared in this scope
     return kx[y]*ky[x]%mod*ky[y-x]%mod;
                  ^
0_0_33871022_15705.cpp: In function 'int main()':
0_0_33871022_15705.cpp:124:8: error: 'ky' was not declared in this scope
        ky[i]=ky[i+1]*(i+1)%mod;
        ^