View Compilation Error

0_0_33074129_27690.cpp: In function 'int main()':
0_0_33074129_27690.cpp:146:19: error: no match for 'operator%' (operand types are 'std::vector<Question>' and 'int')
             u = vt%5
                   ^
0_0_33074129_27690.cpp:146:20: error: expected '}' at end of input
             u = vt%5
                    ^
0_0_33074129_27690.cpp:146:20: error: expected '}' at end of input
0_0_33074129_27690.cpp:146:20: error: expected '}' at end of input