View Compilation Error

0_0_21376039_18828.cpp: In function 'int main(int, char**)':
0_0_21376039_18828.cpp:51:26: error: 'c' was not declared in this scope
     f[i]=1LL*f[i]*pw(j/i,c[min(j+i-1,mx)]-c[j-1])%mod;
                          ^