View Compilation Error

0_0_18236417_26040.cpp: In function 'void init()':
0_0_18236417_26040.cpp:16:32: error: 'memset' was not declared in this scope
  memset(vis, false, sizeof(vis));
                                ^
0_0_18236417_26040.cpp: In function 'int main()':
0_0_18236417_26040.cpp:55:19: error: 'scanf_s' was not declared in this scope
   scanf_s("%d", &s);
                   ^