View Compilation Error

0_0_20029070_29240.cpp: In function 'int main()':
0_0_20029070_29240.cpp:172:48: error: expected '}' at end of input
             ans=( ans+ qpow(2,num[i].a)*x )%mod;
                                                ^
0_0_20029070_29240.cpp:172:48: error: expected '}' at end of input
0_0_20029070_29240.cpp:172:48: error: expected '}' at end of input