View Compilation Error

0_0_29954728_12900.cpp: In function 'int main()':
0_0_29954728_12900.cpp:20:33: error: 'scanf_s' was not declared in this scope
  while ((scanf_s("%d %d", &n, &m)) != EOF) {
                                 ^
0_0_29954728_12900.cpp:21:25: error: 'memset' was not declared in this scope
   memset(a, 0, sizeof(a));
                         ^