View Compilation Error

0_0_28148523_25456.cpp: In function 'int main()':
0_0_28148523_25456.cpp:12:17: error: 'scanf_s' was not declared in this scope
  scanf_s("%d",&n);
                 ^
0_0_28148523_25456.cpp:32:29: error: 'c' was not declared in this scope
      (b[i][0]==b[max][0] && c[i][1]<c[max][1])||
                             ^