View Compilation Error

0_0_20961989_20068.cpp: In function 'int main()':
0_0_20961989_20068.cpp:11:27: error: 'scanf' was not declared in this scope
  while (~scanf("%s", &data)) {
                           ^
0_0_20961989_20068.cpp:13:20: error: 'strlen' was not declared in this scope
   len = strlen(data);
                    ^
0_0_20961989_20068.cpp:15:19: error: 'printf' was not declared in this scope
    printf("None\n");
                   ^
0_0_20961989_20068.cpp:33:21: error: 'printf' was not declared in this scope
      printf("None\n");
                     ^
0_0_20961989_20068.cpp:47:20: error: 'printf' was not declared in this scope
     printf("None\n");
                    ^
0_0_20961989_20068.cpp:61:20: error: 'printf' was not declared in this scope
     printf("Many\n");
                    ^
0_0_20961989_20068.cpp:64:22: error: 'printf' was not declared in this scope
     printf("Unique\n");
                      ^