#include <stdio.h>

int main() {
  int a, b;

  scanf("%d %d", &a, &b);

  if (a % 2 == 0 || b % 2 != 0) {
    printf("YES");
  } else {
    printf("NO");
  }

  return 0;
}

Posted by Deepto Shome Pritom 4 Feb 2017 21:06
Test 1:
Den's keys: 0001
            0000

           1st night   2nd night   3rd night  4th night  ... ... ...    All nights

bike's key 0001        0000        0001       0000                      -

bad man    0000        0001        0003       0004                      -

result     no          no          no         no                        no

Test 2:
Den's keys: 0002
            0001

           1st night   2nd night   3rd night  4th night  ... ... ...    All nights

bike's key 0002        0001        0002       0001                      -

bad man    0000        0001        0003       0004                      -

result     no          yes         no         no                        yes

In the first test all nights result is "no". That why in the first test result is no.



try to understand .. happy coding

Edited by author 19.07.2017 23:44