View Compilation Error

0_0_27842475_31225.cpp: In function 'int main()':
0_0_27842475_31225.cpp:40:26: error: 'scanf_s' was not declared in this scope
    scanf_s("%d%d", &a, &b);
                          ^
0_0_27842475_31225.cpp:43:25: error: 'memset' was not declared in this scope
   memset(t, 0, sizeof(t));
                         ^