View Compilation Error

0_0_27752665_2476.cpp: In function 'int main()':
0_0_27752665_2476.cpp:20:20: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
 scanf("%s %s",s1,s2);
                    ^
0_0_27752665_2476.cpp:20:20: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'