View Compilation Error

0_0_21482537_13583.cpp:7:7: error: 'LL' does not name a type
 const LL mod = 998244353;//保证大于(2^31-1)的算数平方根
       ^
0_0_21482537_13583.cpp: In function 'void seg_vis(LL, LL, int)':
0_0_21482537_13583.cpp:31:41: error: 'mod' was not declared in this scope
             num[j]=(num[j]*(k*Count+1))%mod;
                                         ^
0_0_21482537_13583.cpp:38:33: error: 'mod' was not declared in this scope
             num[i]=num[i]*(k+1)%mod;
                                 ^
0_0_21482537_13583.cpp:39:21: error: 'mod' was not declared in this scope
         sum+=num[i]%mod;
                     ^