View Compilation Error

0_0_20026747_23209.cpp: In function 'int main()':
0_0_20026747_23209.cpp:171:37: error: invalid operands of types '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}' and 'const long long int' to binary 'operator%'
             x= (x*pow(3,num[i].b)) %mod;
                                     ^
0_0_20026747_23209.cpp:173:44: error: invalid operands of types '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}' and 'const long long int' to binary 'operator%'
             ans=( ans+ pow(2,num[i].a)*x )%mod;
                                            ^
0_0_20026747_23209.cpp:178:65: error: invalid operands of types '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}' and 'const long long int' to binary 'operator%'
                 ans=(ans+(pow(2,num[i].a)* query_sum(1,b+1,n)) %mod)%mod;
                                                                 ^