View Compilation Error

0_0_39252340_5272.cpp: In function 'int main()':
0_0_39252340_5272.cpp:15:12: error: 'scanf' was not declared in this scope
   15 |     while (scanf("%d%d", &m, &n), m || n)
      |            ^~~~~
0_0_39252340_5272.cpp:18:13: error: 'puts' was not declared in this scope
   18 |             puts(m > n ? "OK" : "Sorry");
      |             ^~~~