View Compilation Error

0_0_15847680_27982.cpp: In function 'int main()':
0_0_15847680_27982.cpp:23:27: error: 'scanf' was not declared in this scope
     while (~scanf("%d", &K)) {
                           ^
0_0_15847680_27982.cpp:28:37: error: 'memset' was not declared in this scope
         memset(line, 0, sizeof(line));
                                     ^
0_0_15847680_27982.cpp:40:27: error: 'printf' was not declared in this scope
         printf("%d\n", all);
                           ^