View Compilation Error

0_0_13548959_18323.cpp: In function 'ull getSum(ull)':
0_0_13548959_18323.cpp:21:5: error: 'll' was not declared in this scope
     ll ans=n;
     ^
0_0_13548959_18323.cpp:22:5: error: 'ans' was not declared in this scope
     ans=(ans*(n+1))%MOD;
     ^
0_0_13548959_18323.cpp:22:21: error: 'MOD' was not declared in this scope
     ans=(ans*(n+1))%MOD;
                     ^
0_0_13548959_18323.cpp:25:14: error: 'res' was not declared in this scope
     ans=(ans*res)%MOD;
              ^