View Compilation Error

0_0_37831722_16326.cpp: In instantiation of 'void read(T&) [with T = int]':
0_0_37831722_16326.cpp:69:11:   required from here
0_0_37831722_16326.cpp:64:12: error: return-statement with a value, in function returning 'void' [-fpermissive]
     return ans;
            ^
0_0_37831722_16326.cpp: In instantiation of 'void read(T&) [with T = long long int]':
0_0_37831722_16326.cpp:71:42:   required from here
0_0_37831722_16326.cpp:64:12: error: return-statement with a value, in function returning 'void' [-fpermissive]