View Compilation Error

0_0_20658061_9515.cpp: In function 'int solve()':
0_0_20658061_9515.cpp:7:13: error: invalid operands of types '__gnu_cxx::__promote_2<int, int, double, double>::__type {aka double}' and 'int' to binary 'operator%'
 #define mod 998244353
             ^
0_0_20658061_9515.cpp:29:53: note: in expansion of macro 'mod'
             t=(long long)a[i][i]*pow(a[j][i],mod-2)%mod;  
                                                     ^