View Compilation Error

0_0_37538430_4732.cpp: In function 'int C(int, int)':
0_0_37538430_4732.cpp:31:5: error: 'll' was not declared in this scope
     ll d = (f[y] * f[x - y]) % mod;
     ^
0_0_37538430_4732.cpp:32:24: error: 'd' was not declared in this scope
     return (f[x] * ksm(d, mod - 2)) % mod;
                        ^