View Compilation Error

0_0_32200111_19303.cpp: In function 'int main()':
0_0_32200111_19303.cpp:19:42: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
         scanf("%s %d:%d:%d",s,&hh,&mm,&ss);
                                          ^