View Compilation Error

0_0_17038092_24796.cpp: In function 'int main()':
0_0_17038092_24796.cpp:24:41: error: 'mod' was not declared in this scope
         m[i]=((long long)m[i-1]*(2*i+1)%mod*ksm(i+2,mod-2,mod)%mod+
                                         ^
0_0_17038092_24796.cpp:28:5: error: 'cin' was not declared in this scope
     cin>>T;
     ^
0_0_17038092_24796.cpp:33:9: error: 'cout' was not declared in this scope
         cout<<m[n]<<endl;
         ^
0_0_17038092_24796.cpp:33:21: error: 'endl' was not declared in this scope
         cout<<m[n]<<endl;
                     ^