View Compilation Error

0_0_30266480_4150.cpp: In function 'int main()':
0_0_30266480_4150.cpp:28:27: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
        while(scanf("%s", s) != EOF) {
                           ^
0_0_30266480_4150.cpp:30:29: error: 'memset' was not declared in this scope
   memset(arr, 0, sizeof(arr));
                             ^