View Compilation Error

0_0_20810176_27692.cpp: In function 'int main()':
0_0_20810176_27692.cpp:17:43: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%d%d%d%d", &n, &m, &k, &s) != EOF)
                                           ^
0_0_20810176_27692.cpp:19:25: error: 'memset' was not declared in this scope
   memset(f, 0, sizeof(f));
                         ^