View Compilation Error

0_0_28755296_24449.cpp: In function 'void CalC()':
0_0_28755296_24449.cpp:11:51: error: 'mo' was not declared in this scope
             else C[i][j] = (C[i-1][j]+C[i-1][j-1]+mo)%mo;
                                                   ^
0_0_28755296_24449.cpp: In function 'int main()':
0_0_28755296_24449.cpp:29:59: error: 'mo' was not declared in this scope
                         sum = (sum + (K-k+1)*C[r-1][j-1])%mo;
                                                           ^
0_0_28755296_24449.cpp:34:15: error: 'sum' was not declared in this scope
         cout<<sum<<endl;
               ^
0_0_28755296_24449.cpp: At global scope:
0_0_28755296_24449.cpp:36:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_28755296_24449.cpp:37:1: error: expected declaration before '}' token
 }
 ^