View Compilation Error

0_0_20026744_6832.cpp: In function 'int main()':
0_0_20026744_6832.cpp:171:33: error: invalid operands of types '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}' and 'const int' to binary 'operator%'
             x=x*pow(3,num[i].b)%mod;
                                 ^
0_0_20026744_6832.cpp:173:43: error: invalid operands of types '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}' and 'const int' to binary 'operator%'
             ans=( ans+ (pow(2,num[i].a)*x%mod) )%mod;
                                           ^
0_0_20026744_6832.cpp:178:65: error: invalid operands of types '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}' and 'const int' to binary 'operator%'
                 ans=(ans+(pow(2,num[i].a)* (query_sum(1,b+1,n))%mod ) %mod)%mod;
                                                                 ^