View Compilation Error

0_0_33966977_14875.cpp: In function 'int main()':
0_0_33966977_14875.cpp:21:25: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
             scanf("%s",s);
                         ^
0_0_33966977_14875.cpp:31:30: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
                 scanf("%s",tt);
                              ^