Problem	exam
User	qiutian
Submission Time	2026-01-07 10:56:40
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

exam.cpp: In function ‘int main()’:
exam.cpp:14:48: error: cannot convert ‘__gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type’ {aka ‘std::__cxx11::basic_string<char>’} to ‘const char*’
14 | printf(atoi(lines[1].c_str())*atoi(lines[3]).c_str());
| ^
| |
| __gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/features.h:461,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/iost